On a Belgium keyboard (assuming Belgium because that's what your profile says), SHIFT+1 is &. On a US/UK (and other EN) layout that equates to !. Still I can't see anything in your profile on the & key (any variation of) that would cause a focus shift, so you might need to check out your in game binds. If we were talking Danske, then I'd say that you are referring to your IWT mapped key.

Anyway.

You're issue is, your Activate Maps mapped key loads a bunch of key maps, and will even load those that are not originally assigned to your Hunter character set (a State On does not look at the original assignment because you can enable Key Maps on the fly). This will occur when you Disable Key Maps, and then re-Enable them again. You can avoid this by setting some Whitelist/Blacklist of Key Maps per character set.
Select your Character Set in the top left, select the "Key Map White/Black lists"m and probably the Whitelist option is easier to set with your configuration.

I can see the focus actions in the Combat key map. These are a little confusing as I don't know what your T key is doing in game. I assume it is running a Macro of some description. This might be where the issue is. The other potential is that the Actions in the IWT focus, may not run in the order you expect.