can someone explain this to me

cuz i cant figure this guys play out, i called on the end cuz this guy has been betting every scare card that comes out, how on earth does he call the turn, please someone tell me if there is a logical reason

Party Poker 3/6 Hold'em (9 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP1 with Qs, As.
1 fold, UTG+1 calls, Hero raises, 4 folds, SB calls, 1 fold, UTG+1 calls.

Flop: (7 SB) 9d, 4c, 7d (3 players)
SB checks, UTG+1 checks, Hero bets, SB calls, UTG+1 calls.

Turn: (5 BB) 9s (3 players)
SB checks, UTG+1 checks, Hero bets, SB folds, UTG+1 calls.

River: (7 BB) 3d (2 players)
UTG+1 bets, Hero calls.

Final Pot: 9 BB

Results in white below:
UTG+1 has 5h 3h (two pair, nines and threes).
Hero has Qs As (one pair, nines).
Outcome: UTG+1 wins 9 BB.