picture showing the structures in question[ibb.co]

Took a picture with my phone because my computer is currently running Ark, Photoshop, and a virus scan with great difficulty, and I’m worried it’ll explode if I start trying to screenshot and post on steam too.

I’m trying to place an inverted gable wall on top of a gable wall(stepped). To the right of the screenshot, you can see where I’ve successfully done that already. They place no problem.

But on the left of the image, where you see a stepped gable wall with nothing above it. I can’t place an inverted gable on top. It auto-demolishes the stepped gable. Same if I place the inverted one first, then the stepped gable after. Whichever structure I place second destroys the one that was placed first.

The building as a whole is symmetrical, and there are no obvious structural differences or snap points discrepancies I can see which would cause it to work in one area but not another.

Does anyone have any ideas? It’s not mega important but I love the extra texture and detail a stepped gable brings to a flat wall. Thanks for any advice and thanks to the mod author for making this. It adds so much creative expression to the game :)