Collusion?

[glb]

1/2 Pot Limit Omaha 7 handed

Villian 1 BB ($250)
Villian 2 UTG staddles to $4 ($300)
Me UTG+1 double straddles to $6 ($160)
UTG+2 triple straddles to $8
MP calls $8
Button calls $8
Villian1 calls $6
Villian2 calls $4
Me A [img]/images/graemlins/diamond.gif[/img] A [img]/images/graemlins/spade.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/heart.gif[/img]
I raise $30.
Villian1 calls $30.
Villian2 calls $30.

Flop K [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/club.gif[/img]

Villian1 checks.
Villian2 checks.
I check.

Turn 4 [img]/images/graemlins/spade.gif[/img]

Villian1 bets $100.
Villian2 calls $100.

River 9 [img]/images/graemlins/spade.gif[/img]

Villian1 bets $60.
Villian2 calls $60.

Villian1 K [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/club.gif[/img]
Villian2 K [img]/images/graemlins/spade.gif[/img] 2 [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/heart.gif[/img] 3 [img]/images/graemlins/club.gif[/img]

The action just seems strange to me.

Note: Villians come together every week and always sit together.