Anybody know why it's reraising all these pocket pairs? Especially 88? What would villain be calling with?

I'm also don't understand why it's calling gutshots in a low SPR spot. This really confuses me, the only logic I see in calling with a gutshot with so little stack left is to donk turn as a bluff after OOP checks, which I assume won't be happening often. But the again my postflop play isn't very strong so I might be thinking about this wrong.

Also I realize I forgot to remove my 4 bet hands from the range, if that would make a huge difference I will rerun the sim.

Edit: Sorry, the image got super blurry after uploading. I raised 3x from CU, BB 3bet 4x, I called. He led for half pot on the flop and I called. He shoved his remaining $5.15 into a $7.35 pot and I called.

In the solver blue is Re-raise (shove), green is Call, red is Fold