All of them are complex profile walls, where connection lines are created. Why?

[LeeJaeYoung]

The rest of the walls are fine.
is this normal?

[Lucian Laculeanu]

I don't see a lot of details you would need to disclose, but here is a list:

- If the primitives used are the same - are they in the same layer group?

- Is the surface the same on both elements?

- Look at the alignment. The smallest miss-alignment could show that....