God damit, haven't they learned yet. This bug was in BF:V and the original BF:1942. I bind mouse2 to move foward, then bind space to move backwards and it erases what I had bound to move forward. Same if I try the other way around. I also can't bind ALT, it keeps telling me there's a conflict in the common controls, but it isn't bound to a damn thing.
"You can either want something to be true, or you can want the truth. Pick one." - Mr. Diety