RCtrl+1 doesn't work. What is the reason?

Question

Keyboard

I found that they FARstopped working RCtrl+1and RCtrl+2, RCtrl+3etc. - they work.
I checked several programs on the list - they do not work.
Spare keyboard (USB) - do not work.
ShortCutToText( ShortCut( Key, Shift ))gives Ctrl+Ctrl(x11) instead Ctrl+1of (x31).
What is the reason?
Adding . Since I consider it unsportsmanlike to look for a process involved in interception by enumeration, I first made sure that the interception itself is carried out:

Ethervane ActiveHotkeys

Answer 1

Try uninstalling the keyboard driver and reboot and check.
Try removing all keyboard layouts except US and check.

Answer 2

There may be a software problem. For example, some application intercepts keystrokes (keyboard hook) and incorrectly passes event processing further. In this case, you need to remove everything from startup and, after rebooting, kill all unnecessary applications through the task manager. Check.