1998 Honda CRV battery

My 1998 CRV recently has been having problems with the door locks. I have the alarm installed but decide not to use it, so for a while I just locked my doors manually. Up until recently, before I get out of my car I would lock all of my 4 doors from the inside, as soon as I would close the drivers door the two back door locks would unlock. So solving this problem I would close my drivers door first, then open the back doors and lock them individually. For some reason now after doing this I would come back in the morning and find that my battery is drained and the two back doors are unlocked again. The next time I tried doing this I again closed the drivers door and lock the back doors individually, but as soon as I push down the lock, it would pop right back up again. Is this some sort of anti-lock my keys in my car thing? Or is it just some malfunction in the door locks? Should I disconnect the locks and just keep doing them manually?

also, why would it be draining my battery? I replaced it with a new one already and it has somewhat depleted most of that one now.