I'm a little late with this reply and I saw that you found a fix but I was just wondering this: is it possible that the tiered seating are all in different "rooms"? When you click on them in buy/build mode, does the game select the entire theatre or just the area where the seats are on the same level as each other?
I'm asking because it would make sense to me that sims can't see the tv if they're in (what the game thinks) is a different room than the actual tv. Which could explain why they all move to the level where the tv is at. Maybe the outdoor screen works differently, I would assume an outdoor screen isn't limited to a "room" as you often have different area's outside (garden, patio and whatever you have outside).
I'm glad you found a fix though! I'm just asking because I'm intrigued and in case something like this happens in the future.
Oh and your build looks awesome! Nice job! 😃
