AQo UTG+1 Open, Flop TopPair

Hand converted with online PokerStrategy.com hand converter:

Replay della mano

€0.05/€0.1 Fixed-Limit Hold'em (9 handed)

Preflop: Hero is UTG2 with Q:h, A:c.
UTG1 folds, Hero raises, 3 folds, CO calls, BU calls, SB folds, BB calls.

Flop: (12.4 SB) Q:d, 2:c, 6:c (4 players)
BB checks, Hero bets, CO folds, BU calls, BB folds.

Turn: (12.2 BB) 4:s (2 players)
Hero bets, BU raises, Hero 3-Bets, BU calls.

River: (52 BB) 8:s (2 players)

Final Pot: 52 BB.
Results follow:

Hero shows a pair of queens(Q:h A:c).
BU shows three of a kind, sixes(6:d 6:h).

BU wins with three of a kind, sixes(6:d 6:h).

Vedo molte volte questi spot, ed altrettante volte perdo il piatto giocando in questo modo. Vorrei sapere se sbaglio qualcosa. Cmq è NL non PL.