problem display cross-section walls

[bagiolino]

hello to everyone, I've got something strange:
I designed perimeter walls (calculating an imported dwg file in revit), I created my stratigraphy and noticed that in 3d it creates a vertical line to the junction of the two walls!
I tried to redesign the walls, to reduce them but nothing!
I attach the pictures to make you understand better!
Good evening.

 

[bagiolino]

I think I found the mistake:
the walls were not all carriers (I had modified them) and in fact once uniform the problem solved!
I still hope to be of help for someone.
Hi.