Control settings

This problem has never happened to me before with this game.
I put the control settings in order and when I go into game:

- button C (which i always change to previous weapon), does on the same time switch weapon + open the bag + shows the radio message list, all 3 of them on the same time
- moving left keeps switching to previous weapon

I have a french keyboard but that should not change anything what so ever. I've played with french keyboards before...
This is honestly the weirdest thing I've encountered and it is absolutely frustrating and makes it literally impossible to play. I've spent money for this game in the past and would like to play again.

I've already tried changing keyboard language etc but hasn't fixed the issue either.

Any solutions to this problem?