AA iso-raise pot BU vs CO, check-raised on rainbow board

partypoker fastforward, Hold'em No Limit - $0.05/$0.10 - 6 players
Replay this hand on Upswing Poker

UTG: $12.49 (125 bb)
MP: $12.29 (123 bb)
CO: $20.14 (201 bb)
BU (Hero): $12.23 (122 bb)
SB: $12.91 (129 bb)
BB: $12.00 (120 bb)

Pre-Flop: ($0.15) Hero is BTN with A♠ A♣
2 players fold, CO calls $0.10, Hero raises to $0.45, 1 fold, BB calls $0.35, CO calls $0.35

Pretty standard, raising pot preflop for value.

Flop: ($1.40) 5♣ 3♥ J♦ (3 players)
BB checks, CO checks, Hero bets $0.99, BB calls $0.99, CO raises to $1.98, Hero calls $0.99, BB calls $0.99

Betting for value. I think calling here is a mistake - one pair hands probably just check/call behind, and we are not beating anything else.

Turn: ($7.34) K♠ (3 players)
BB checks, CO bets $3.49, Hero calls $3.49, BB folds

Think this is a mistake as well - we are only beating AK that decided to float and QQ here.

River: ($14.32) 7♥ (2 players)
CO bets $6.80, Hero calls $6.31 (all-in)