Some doors are locked as originally I was going to add a key mechanic but ran out of time.
As for acting weird I think I know which door you mean. I had to swap out that doors animation for a different one at the last minute since the opening trigger got triggered by the door itself during it's animation. It's fine for the most part , but if your timing is off and you don't move backward enough the animation can get reset before it's finished. If that were to happen move a bit more to the back and wait a bit for now. I'll see what I can do about it later, there are lots of things that still need to be added to the game, so I can't make any promises on which update will adress that animation, but I plan to release a lot of updates for this one.