How to fix this overlap?

[Team147_X]

[Okidoki]

As i just wrote… check normals…

Exporting UV’s to procreate

Welcome … this looks like an inverted normal problem… to view this try (top right ) Viewport Overlays → Face Orientation… everything should be blue…then (or just this) *Mesh → Normals: Recaluculate (outside… mostly…).

…here for the wall…