Villain Makes a Fishy Play

[toss]

Villain is 61/24.59/1.67 over 60 hands. These stats are misleading. He's not that crazy preflop (he'll raise QJo+, 99+) and his aggr. numbers are high because he hit a lot of flops. He does however play way too many hands and calls a lot. Sometimes he'll play really weird postflop. One hand he checked two pair to villain on the turn and river.

Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is MP with A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Button 3-bets</font>, <font color="#666666">2 folds</font>, Hero calls.

Flop: (7.40 SB) K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

Turn: (3.70 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>...

Okay what the hell? First of all why the hell did he check the flop? Was he slowplaying? Did he miss? Well I'm getting like 4.85:1 on a calldown plus I can improve.