/diy/ - Do It Yourself

I made some test prints to test different support patterns on my bowl shape, and I noticed that the underside of the bowl is deformed for some reason, aside the roughness caused by the supports. The inner wall is fine, but parts of the outer wall don't follow the curve exactly; it looks like they were pushed inward by something, giving the exterior a kind of half-melted look. The effect is present even on parts of the print that weren't directly touching the support structure.

What could cause this? Neither the model nor the layer preview in the slicer show the deformity, so I don't think it's the slicer's fault. But all the tests that I've printed have it in the same place.