CardLayout not rendering properly on windows

I've been working on a login screen for a new project and came across a weird rendering "error" while using CardLayout on windows. SignUp screen on Mac:SignUp Screen Mac The screens load up correctly on my Mac computer, but on windows they look like these after you click "Register" or after you click "Back". The same screens on windows:SignUp Screen Windows As you can see, on windows the SignUp "card" from the CardLayout is rendered over the Login "card" without hiding the other one and vise versa, not like on mac. Now my question is, could this be caused because of the transparent background and therefore windows thinks that the one behind should still be visible, or could it be creating a brand new "card" each time i switch, or just be forgetting to hide the one in the back all together? And also, how could i go about fixing this? I will put the whole Class so you can test it for yourself. (Side note: you may also notice that the button "Register" shows the white button shape on windows even though it has btnRegister.setBorder(null); set (works on Mac)) The complete one Class code: package testing; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import utilities.ComponentMover; import java.awt.CardLayout; import java.awt.Color; import java.awt.Font; import java.awt.Insets; import javax.swing.JSeparator; import javax.swing.JPasswordField; @SuppressWarnings("serial") public class ClientStarter extends JFrame implements ActionListener { JPanel cards; private int height = 450; private int width = 700; private int trasparancy = 90; private int labelWidth = 400; final static String BACK = "Back"; final static String REGISTER = "Register"; private Color textLine = Color.GRAY; private Color textColor = Color.WHITE; private Color tipColor = Color.GRAY; private Color disabledTipColor = new Color(90, 90, 90); // LOGIN // JPanel loginCard; public static JTextField usernameIn = new JTextField(); private JLabel userLabel = new JLabel("Username :"); public static JPasswordField passwordIn = new JPasswordField(); private JLabel passLabel = new JLabel("Password :"); private JButton btnLogin = new JButton("Login"); private JButton btnRegister = new JButton(REGISTER); private JLabel registerLabel = new JLabel("Don't own an Account? "); private JSeparator separatorUser = new JSeparator(); private JSeparator separatorPass = new JSeparator(); // SIGNUP // JPanel joinCard; public static JTextField emailNew = new JTextField(); public static JLabel newEmailLabel = new JLabel("Email : (Not Available)"); public static JTextField usernameNew = new JTextField(); public static JLabel newUserLabel = new JLabel("Username :"); public static JTextField passwordNew = new JTextField(); public static JLabel newPassLabel = new JLabel("Password :"); public static JTextField passwordNew2 = new JTextField(); public static JLabel newPassLabel2 = new JLabel("Re-enter password :"); private JButton btnSignUp = new JButton("Signup"); private JButton btnBack = new JButton(BACK); private JSeparator separatorMailNew = new JSeparator(); private JSeparator separatorUserNew = new JSeparator(); private JSeparator separatorPassNew = new JSeparator(); private JSeparator separatorPassNew2 = new JSeparator(); public ClientStarter() { getContentPane().setBackground(Color.GRAY); setUndecorated(true); setBackground(new Color(0, 0, 0, trasparancy)); setTitle("EnChant"); setSize(width, height); setDefaultCloseOperation(EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); setResizable(false); //Create the cards // LOGIN // Font avenir = new Font("Avenir", Font.PLAIN, 18); loginCard = new JPanel(); loginCard.setLayout(null); usernameIn.setBounds(348, 150, 327, 35); usernameIn.setColumns(10); usernameIn.setFont(avenir); usernameIn.setBorder(null); passwordIn.setBounds(348, usernameIn.getY() + 74, 327, 35); passwordIn.setColumns(10); passwordIn.setFont(avenir); passwordIn.setBorder(null); userLabel.setBounds(usernameIn.getX(), usernameIn.getY() - 20, labelWidth, 16); userLabel.setFont(avenir); passLabel.setBounds(passwordIn.getX(), passwordIn.getY() - 20, labelWidth, 16); passLabel.setFont(avenir); btnLogin.setBounds(348, passwordIn.getY() + 81, 327, 45); btnLogin.addActionListener(this); registerLabel.setBounds(btnLogin.getX(), btnLogin.getY() + btnLogin.getHeight() + 5, labelWidth, 16); registerLabel.setFont(new Font("Avenir", Font.PLAIN, 13)); btnRegister.setBounds(btnLogin.getX() + 130, registerLabel.getY() - 1, 70, 16); btnRegister.addActionListener(this); btnRegister.setBorder(null); loginCard.setBackground(new Color(0, 0, 0, trasparancy)); usernameIn.setBackground(new Color(0, 0, 0, 0)); usernameIn.setForeground(textColor); passwordIn.setBackground(new Color(0, 0, 0, 0)); passwordIn.setForeground(textColor); userLabel.setForeground(tipColor); passLabel.setForeground(tipColor); btnLogin.setForeground(new Color(70, 130, 180)); btnLogin.setBackground(Color.WHITE); btnRegister.setForeground(new Color(70, 130, 180)); registerLabel.setForeground(tipColor); separatorUser.setForeground(textLine); separatorUser.setBounds(usernameIn.getX(), usernameIn.getY()+usernameIn.getHeight()-8, usernameIn.getWidth(), 6); separatorPass.setForeground(textLine); separatorPass.setBounds(passwordIn.getX(), passwordIn.getY()+passwordIn.getHeight()-8, passwordIn.getWidth(), 6); loginCard.add(usernameIn); loginCard.add(separatorUser); loginCard.add(userLabel); loginCard.add(passwordIn); loginCard.add(separatorPass); loginCard.add(passLabel); loginCard.add(btnLogin); loginCard.add(btnRegister); loginCard.add(registerLabel); // SIGNUP // joinCard = new JPanel(); joinCard.setLayout(null); emailNew.setBounds(348, 62, 327, 35); emailNew.setColumns(10); emailNew.setFont(avenir); emailNew.setBorder(null); emailNew.setEditable(false); usernameNew.setBounds(348, emailNew.getY() + 74, 327, 35); usernameNew.setColumns(10); usernameNew.setFont(avenir); usernameNew.setBorder(null); passwordNew.setBounds(348, usernameNew.getY() + 74, 327, 35); passwordNew.setColumns(10); passwordNew.setFont(avenir); passwordNew.setBorder(null); passwordNew2.setBounds(348, passwordNew.getY() + 74, 327, 35); passwordNew2.setColumns(10); passwordNew2.setFont(avenir); passwordNew2.setBorder(null); //32, 106, 180, 254 : 2, 76, 150, 224 newEmailLabel.setBounds(emailNew.getX(), emailNew.getY() - 20, labelWidth, 16); newEmailLabel.setFont(avenir); newUserLabel.setBounds(usernameNew.getX(), usernameNew.getY() - 20, labelWidth, 16); newUserLabel.setFont(avenir); newPassLabel.setBounds(passwordNew.getX(), passwordNew.getY() - 20, labelWidth, 16); newPassLabel.setFont(avenir); newPassLabel2.setBounds(passwordNew2.getX(), passwordNew2.getY() - 20, labelWidth, 16); newPassLabel2.setFont(avenir); btnSignUp.setBounds(348, passwordNew2.getY() + 71, 327, 45); //335 // +81 btnSignUp.addActionListener(this); btnBack.setBounds(btnSignUp.getX()-70, btnSignUp.getY(), 70, 45); //380 btnBack.addActionListener(this); joinCard.setBackground(new Color(0, 0, 0, trasparancy)); emailNew.setBackground(new Color(0, 0, 0, 0)); emailNew.setForeground(textColor); usernameNew.setBackground(new Color(0, 0, 0, 0)); usernameNew.setForeground(textColor); passwordNew.setBackground(new Color(0, 0, 0, 0)); passwordNew.setForeground(textColor); passwordNew2.setBackground(new Color(0, 0, 0, 0)); passwordNew2.setForeground(textColor); newEmailLabel.setForeground(disabledTipColor); newUserLabel.setForeground(tipColor); newPassLabel.setForeground(tipColor); newPassLabel2.setForeground(tipColor); btnSignUp.setForeground(new Color(70, 130, 180)); btnBack.setBackground(Color.WHITE); separatorMailNew.setBounds(emailNew.getX(), emailNew.getY()+emailNew.getHeight()-8, emailNew.getWidth(), 6); separatorMailNew.setForeground(textLine); separatorUserNew.setBounds(usernameNew.getX(), usernameNew.getY()+usernameNew.getHeight()-8, usernameNew.getWidth(), 6); separatorUserNew.setForeground(textLine); separatorPassNew.setBounds(passwordNew.getX(), passwordNew.getY()+passwordNew.getHeight()-8, passwordNew.getWidth(), 6); separatorPassNew.setForeground(textLine); separatorPassNew2.setBounds(passwordNew2.getX(), passwordNew2.getY()+passwordNew2.getHeight()-8, passwordNew2.getWidth(), 6); separatorPassNew2.setForeground(textLine); joinCard.add(emailNew); joinCard.add(newEmailLabel); joinCard.add(usernameNew); joinCard.add(newUserLabel); joinCard.add(passwordNew); joinCard.add(newPassLabel); joinCard.add(passwordNew2); joinCard.add(newPassLabel2); joinCard.add(btnSignUp); joinCard.add(btnBack); joinCard.add(separatorMailNew); joinCard.add(separatorUserNew); joinCard.add(separatorPassNew); joinCard.add(separatorPassNew2); // End // JPanel whiteRectLogin = new JPanel(); whiteRectLogin.setBackground( Color.WHITE ); whiteRectLogin.setBounds(0, 0, 250, height); loginCard.add(whiteRectLogin); JPanel whiteRectJoin = new JPanel(); whiteRectJoin.setBackground( Color.WHITE ); whiteRectJoin.setBounds(0, 0, 250, height); joinCard.add(whiteRectJoin); cards = new JPanel(new CardLayout()); cards.setBackground(new Color(0, 0, 0, trasparancy)); cards.add(loginCard, BACK); cards.add(joinCard, REGISTER); getContentPane().add(cards); //Top, Left, bottom, right ComponentMover cm = new ComponentMover(this, this); cm.setEdgeInsets(new Insets(-50, 1, 0, -50)); validate(); repaint(); getContentPane().setLayout(null); } public void actionPerformed(ActionEvent e) { if(e.getSource() == btnRegister) { CardLayout cl = (CardLayout) (cards.getLayout()); cl.show(cards, REGISTER); loginCard.setVisible(false); } if(e.getSource() == btnBack) { CardLayout cl = (CardLayout) (cards.getLayout()); cl.show(cards, BACK); loginCard.setVisible(false); } if(e.getSource() == btnSignUp) { //new SignUpCheck(); } } public static void main(String[] args) { new ClientStarter(); } }