arlis:
It looks like the vectorial 3d hatchings are running in the opposite directions (maybe the walls were drawn left/right and right/left). In the 3D Window, select one of the walls, use the command Align 3D Texture >
Set Direction..., click on the wall, the
Align 3D Texture dialog box appears, select
Define angle numerically, and enter
180˚.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David