Keyboard misinterpretation on Macbook
I have English and Vietnamese keyboard on my Macbook. Yesterday, French keyboard was added. Unfortunately, now the Vietnamese keyboard is affected by the French one. I switch to Vietnamese keyboard, but it still performs French keyboard instead. For example, when French keyboard mode is on, key A performs letter Q and vice versa. Then, when Vietnamese keyboard mode is on, key A still performs letter Q, it does not return to letter A as usual.
Could you please what problem it is and how to fix it? Thank you for your help.
MacBook Pro 13”, macOS 10.15