Thoughts on this hand? I didnt bet the river thinking that I would only get called by a better hand.

PokerStars 2/4 Hold'em (9 handed)

Preflop: Hero is MP1 with , .
UTG raises, UTG+1 calls, Hero 3-bets, 6 folds, UTG calls, UTG+1 calls.

Flop: (10.50 SB) , , (3 players)
UTG bets, UTG+1 calls, Hero raises, UTG calls, UTG+1 calls.

Turn: (8.25 BB) (3 players)
UTG checks, UTG+1 bets, Hero raises, UTG calls, UTG+1 calls.

River: (14.25 BB) (3 players)
UTG checks, UTG+1 checks, Hero checks.

Final Pot: 14.25 BB

Results in white below:
UTG has Qc Kc (one pair, queens).
UTG+1 has Ah Jd (two pair, aces and jacks).
Hero has As Kh (one pair, aces).
Outcome: UTG+1 wins 14.25 BB.

UTG looks like he either has a A with a weak kicker (lower than King), or a flush draw (KQs?). UTG +1 was testing you with his donk bet to see if his A and weak kicker was good. AQ is the most likely hand, so yeah, I would check.

Guess I was wrong about UTG+1. Pretty passive guy.