Converter messed up, opp went allin after I raised the river and I called.

Yeah, betting this flop is kinda bad. There are no real draws out there and I have a high pair so the perils of giving a free card are small. If I bet I'll mostly only get called by better hands and fold out weaker hands that will bet or call a bet on later streets (because I feigned weakness by checking the flop). (note that this is in position, things change slightly when I'm OOP). If I had 87 on a A76 board I would bet instead of checking to protect my hand because giving a free card is much worse here.

And thinking on it, I should probably just call river, his big potsizede river bet is only a pure bluff (that wont call a raise) or a better hand (than my twopair) valuebetting.

For the resultsoriented he had a 55 for a turned set of fives.