Ctrl key doesn't work for making control groups

Hi, I have an issue where my ctrl key doesn’t work for making control groups. Shift + number usually adds units to a control group, which still works, but I can’t redefine them using ctrl. However, if I press shift + ctrl + a number I get the functionality of using only ctrl, and can redefine groups. Without also pressing shift though, holding ctrl and pressing a number key does nothing. Outside of wc3 my ctrl key works just fine so there is no issue with my keyboard.

Some things I have tried without success:
-Disabling all custom keybinds
-Ahk to swap space and ctrl
-Fresh reinstall
-Disabling and enabling every setting I could think of
-Opening a support ticket
-Deleting War3Preferences.txt

You better try to check your keyboard settings + drivers.
Does in other games work?

Do you have AutoHotKey or similar program installed?

Yes, it works absolutely fine in every other game and program. Only in WC3 for some reason.

I do have AHK installed. I tried using it to swap ctrl and space. If I do this, ctrl key now works like space key normally, i.e. zoom camera to last event. Space key now does nothing.

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Absolutely correct, you cannot set groups for buildings and double click on same buildings to highlight in groups .