[Error] Character stands when prone for no reason

I made a thread on the Steam Discussion forums but I think it's more appropriate here.



http://ift.tt/1BmNTl4



When prone, holding Mouse1 causes my character to stand straight up upon release. When standing straight up, holding and then releasing Mouse1 causes the character to crouch. If stuck to cover it removes you from cover.



I'm using the default button config. I've clicked default many times, I've checked the binds, everything checks out. If I unbind mouse1 and rebind fire to another button, the problem ceases. However, this isn't viable for actual matches. If I go into mouse properties and switch to left hand mode, holding Mouse2 will now cause the problem.



I've asked in-game and people have responded as having the same problem. In the steam thread one other person said they had the same issue, though the thread was poorly named so I assume others have passed over it.



This problem makes it impossible to effectively use machine guns, and it causes aggravating deaths when you're prone firing and you suddenly stand straight up.