Could UTG+1 be running a squeeze here with something like JJ?

He coldcalls the pfr, then cold calls a small bet on the flop but then you raise and UTG just cold-calls and he comes over the top to rep the nuts knowing you can only really call with one hand (and since UTG only called your raise rather than re-raised he can't have a really strong hand) and he still has outs if you call?

Of course UTG is also an issue still as even if you call here, he still has to act and has taken a really weird line.....it's all very strange.

I doubt UTG has air but most likely has something like AK/AQ (with AQ most likely for the overcards + gutshot) while QJs is a real possibility for UTG+1 I guess if he is also running stats on UTG and has him as a maniac.

I'd felt it here, but I have a hard time getting away from hands like this so YMMV