Hatched 'appearance' for non-hatched polygons

[tom66]

I've noticed some polygons on our design look hatched.  Does anyone know why this is the case?

The polygon is set as a solid fill.

Can't find any info on the 'net.

[ajb]

There are net override colors applied to the Gnd and 1V8 nets: https://www.altium.com/documentation/altium-designer/using-net-highlight-color-schematics-pcb

This is purely a display thing in the PCB editor, it will not affect fabrication outputs.