Mac Keyboard Types Double Letters: Causes and Solutions
Causes of Double Letter Typing on Mac Keyboards
If you've tried the above solutions and the problem still persists, it may be worth troubleshooting your Mac's keyboard settings. Check the Keyboard preferences pane to see if there are any settings that could be causing the issue. You can also try resetting the System Management Controller (SMC) or the Power Management Unit (PMU) to see if that resolves the problem. If none of these solutions work, you may need to consider visiting an Apple Store or authorized service provider for further assistance.