Hi,
This is happening because geometry wired to a Marker input isn't ever sliced at corners, instead it is deformed to follow the path. Unfortunately at present due to the way RC works internally, there isn't a way to change that behaviour. In this case, I think the best course of action would be to use Material IDs assigned to the spline instead, which would allow you to easily set the length of the balconies by dividing up the path.
I hope that helps,
Paul.