First, check that the toggled modifier keys (i.e. Shift, Control, Alt, and Command keys) on your keyboard are not stuck in the positions.

1. Check the Keyboard Connection: Make sure that your keyboard is securely connected to your computer.
2. Check for Software Updates: Make sure that any software you might need (e.g. drivers) is updated to the most recent version.
3. Assign New Keyboard Shortcuts: If the above steps don’t work, you can try reassigning new keyboard shortcuts.
4. Remove Interfering Applications: Make sure that there are no applications running in the background that may be interfering with your keyboard shortcuts.
5. Reset your Keyboard Settings: If you still have issues, try resetting your keyboard settings to their default values.