It does feel awkward. You did the right thing imho but with a push, your call and then the third guy calling too, I'm guessing one of em did have AA/KK? Best case scenario would indeed be 55 and AK, or a third set on the river blank.

I think solid players will often reraise with AA/KK, but sometimes not.. a sort-of slowplay, they give you some "odds to suck out" for masking their real hand strength. If one of em DID have AA/KK here, then it worked lol. I'm hoping for you it was AK/55/other set though. Or that maybe a guy donked it afterall with Ax/QQ/JJ etc.