FAF client changes my keyboard layout?

I'm set to UK keyboard but whenever I have FAF running " and @ (and other keys like | and ~) are swapped around as if I was set to US keyboard, even in other programs like Chrome.

Does anybody else have this issue?

I am playing with german keyboard and FAF does not change it.
(and i have never seen that a user has this problem)

Maybe you pressed [ALT]+[SHIFT] and changed the keyboard layout with it ?

Also possible your windows is using a different layout for the SupCom App.
Maybe this can help:
https://www.tenforums.com/tutorials/102999-turn-off-use-different-keyboard-layout-each-app-window.html

You can remove the us keyboard from windows. May install it again next update mind you. I have had issues with changing keyboards midgame (for reasons as stated by Uveso) and this was the only fix