Forced Crouching/Standing

I noticed that whenever I am inside a door and open or close it, I can't crouch whilst I'm standing, or can't stop crouching whilst in the door. It's not something that I did with the ingame settings; leaving the door lets me crouch or stop crouching as normal.

Note: I did have pictures with the right position for it to work, but they may not be perfectly clear. It works so long as your player is standing inside the door, either from opening or closing it.

Edit: Originally I had thought there was a sound glitch as well, but it turned out, it was just my speakers. Whoops!