Bug/Issue Boss Battles Starting before I Go In The Room

As you can see here, the Nox battle in the Great Pagoda Library despite the fact that I am not in the Boss room. This has happened before quite often with other bosses such as the Erchius Crystal and Big Ape etc. (Don't Have Screenshot Currently Soz ;n. I also somehow glitched out the pre-battle text somehow?

Most of these issues seem to occur via the boss doors. In this specific instance, I simply started rapidly opening and closing the doors, keeping far away as to not get sucked in and the boos fight started. In other circumstances I was somehow able to glitch the doors and make them stay open (I don't know how exactly I caused the bug (It still retained the collision detection of the door when closed and did not suck people in (It could be fixed by closing then re-opening. It would return to functioning as it normally would))).

I was in windowed mode without mods and the game did not crash.

It seems to be a bug related to the game's own faulty programming but if it is needed;
I Use Windows 10
My PC is a Packard bell imedia S3810

Thanks!
Glayce