I've had this issue a few times in the past and I never understood how it happened. Initially i picked up an AK and as you can see it is set to full auto as it should be. I later on find a Beryl and when i pick it up it's set to Single fire for some reason.
I never realised this during the game and when i wanted to take a fight i only then realised but it was too late. I was struggling to press the B key to change it to auto mid fight which made me lost the fight.
I can't reproduce this issue everytime but it will occassionally happen during my games and it's very tilting to deal with mid fight.
Does anybody have any ideas on why this happens and how to fix it?