ya im not sure if its a glitch or not but down in the basement after you cut the pictures on the rope that wall didnt open up. I saw someone else’s play through and it had opened up like right after they started the fire place. Also there wasnt a symbol above it in my game but there was one in the other play through that i saw
The symbol is removed from newer versions, don't worry about that. The game is tracking your progress, it'll let you in down there when it thinks you're ready. There are a lot of things which change on different playthroughs so, yeah, you're gonna see things happen differently in your game.
Have you opened the combination drawer in the office yet?