On mac os, the left and right shift have been swapped, how to return the standard settings?

Question

Keyboard

Quite suddenly, the left shift became right and vice versa. The same, as far as I understand, with the keys alt, ctrl
Now, in order to print in uppercase, you need to hold down the right shift, and if you hold down the left, the following is printed: ЈЏЌ®†Њ (QWERTY)
How to fix it?