I recently decided to replay this game because I find it to be clever and fun.
If this is a common and known problem, just let me know.
This has happened two times now and I'm not sure if I should worry about it or not. I got two different boos down to 0 just as they left their own rooms. I looked everywhere room they could have jumped to, but I couldn't find them anywhere. Does this mean that I actually did capture them? Or have I lost them forever now or... what?
Unfortunately, I wasn't paying attention to how many boos I had before and after, so I can't see with that.
So I got all 50 boos just now and beat the game, it looks like the boo in the Rec Room (the place with the weight lifter) was actually sucked into my vacuum but had the animation of leaving the room. Weird.