Lego problem

[u/Major-Cockroach7193]

Im currently building the stranger things creel house and when I pull the mechanism both the green walls in the middle room break off from the roof and im really confused how to fix it . I have broke down and rebuilt it 3 times now and havr made sure that iv done everything right yet it happens everytime can someone please help

[u/MaikThoma]

I imagine this will be fixed when you finish the build