Some confusing action on the flop

[scott111]

Ultimate Bet 0.25/0.50 Hold'em (10 handed) converter

Preflop: Hero is Button with J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, MP1 calls, MP2 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, SB calls, BB calls, UTG+2 calls, <font color="#CC3333">MP1 3-bets</font>, MP2 calls, Hero calls, SB calls, BB calls, UTG+2 calls.

Flop: (18 SB) 5[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, UTG+2 checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">MP2 raises</font>, Hero calls, SB calls, BB calls, UTG+2 folds, <font color="#CC3333">MP1 3-bets</font>, <font color="#CC3333">MP2 caps</font>, Hero calls, SB folds, BB calls, MP1 calls.

Turn: (18 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, MP1 checks, <font color="#CC3333">MP2 bets</font>, Hero folds, BB calls, MP1 calls.

River: (21 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, MP1 checks, <font color="#CC3333">MP2 bets</font>, BB calls, MP1 calls.

Final Pot: 24 BB