I find that if you put your character into any modified stance that is not default stand or crouch, upon trying to toggle crouch while running your character will instead dive prone.
- Legacy ID
Play as any infantry unit.
Go into a modified stance (ie: in between sitting with weapon drawn and crouching; The low crouch)
Hold down your sprint key while moving (In this case, SHIFT)
attempt to crouch toggle (In this case, X)
Watch your character take a dive to the floor. (Not sure about rifles, but with a pistol drawn, your character dives to the floor and then stands all the way up.)
This isn't TOO bad of an issue, but at times when I'm trying to run from cover to cover, I don't mean to dive and it creates a bit of a turmoil during firefights.