PolyGroup Edit - selected polygroup displays as checkerboard pattern - why?

(UE 5.5.4)
In modeling tools - polygroup edit. As I highlight each polygroup on my mesh, only one shows as a green checkerboard pattern. What does this mean?? (see screenshot below).

Hi John,

That means that you’re looking at the inside of a face. The normals are pointing the other way, this face would not be visible in a non-wireframe view mode unless ‘Two Sided’ was enabled inside of the material applied to it.

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OK, Thanks.

I must have clicked a wrong button along the way as I was trying to do some cleanup. :confused:

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