Gfci has been hooked up properly. Line to line, load to load. Checked the wires with the breaker to confirm. The load terminals have 120v, and the wires just beyond the old terminals read 120v.

All the wires are 12/2 (black, white, ground). The one with 3 sets has a single wire and a 2-into-1 pigtail. The others have just 2 sets of single, or one single

I thought about that too, I have an other outlet that is like that too. No unusual or non-functioning switches that I could find.

That could be a possibility. Every other outlet in the house works and has been tested and verified.