Overbet with fullhouse when thought they had flush for sure

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Party Poker No-Limit Hold'em, $ Hero (6 max, 6 handed) converter

CO ($19.65)
Button ($50.21)
SB ($24.80)
Hero ($23.25)
UTG ($4)
MP ($18.95)

Preflop: Hero is BB with 5[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.10.
UTG calls $0.25, <font color="#666666">1 fold</font>, CO calls $0.25, Button calls $0.25, SB (poster) completes, Hero checks.

Flop: ($1.25) A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets $1</font>, UTG folds, CO folds, Button calls $1, SB calls $1.

Turn: ($4.25) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $2</font>, Button folds, SB calls $2.

River: ($8.25) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $3</font>, SB calls $17.

Final Pot: $28.25