Protrusion on layer with solid infill

Trying to print two models and they both have a floor at around the 6mm height. When the solid infil is laid there is this bulge that appears on the outside even though permitters are printed first.

At first I thought it was a Z banding or something as it happens at the same height for both prints, but then I printed a simple cube and there was no issue at that height.

Problem persists even when printing outer perimeter first, it just makes a slightly bigger circle.

Tried printing in both PS and Orca
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