I checked for the boundairy and its beause i added a path from the extra buildng to chemin tiffin. I thougt the boundary was the road itself and so i snaped the path to it. It wasnt moved significantly

So yes, there are two pavilions, Durocher and saint lambert

I go to that school, but I'm very new to open street map, it's the last person who got them mixed up. As I said, I'm new to osm, so proceed with any needed changes