What the heck kind of playing is this?

[Pok 7's]

Don't get me wrong I'm pleased with the outcome but whaaa??

Party Poker
Limit Holdem Ring game
Limit: $1/$2
5 players


Pre-flop: (5 players) Hero is CO with
UTG raises, Hero 3-bets, Button folds, SB calls, BB folds, UTG caps, Hero calls, SB calls.

Flop: (13SB, 3 players)
SB bets, UTG calls, Hero raises, SB calls, UTG calls.

Turn: (9.5BB, 3 players)
SB checks, UTG checks, Hero bets, SB calls, UTG calls.

River: (12.5BB, 3 players)
SB bets, UTG raises, Hero 3-bets, 2 folds.
Uncalled bets: 1BB returned to Hero.

Results:
Final pot: 17.5BB

[Beavis68]

he probably had QJQ or QJ and tried to bluff you at the river.