($24) Unraised JJ on A-high flop. Weird line check

[Pocketbear]

No reads.

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t20/t40
9 players
Converter

Stack sizes:
UTG: t1545
UTG+1: t1485
Hero: t1455
MP2: t1355
MP3: t1870
CO: t1455
Button: t1510
SB: t1325
BB: t1500

Pre-flop: (9 players) Hero is MP1 with J[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/heart.gif[/img]
2 folds, Hero calls t40 <font color="aaaaaa">(pot was t60)</font>, 4 folds, SB calls t20 <font color="aaaaaa">(pot was t100)</font>, BB checks.

Flop: 5[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (t120, 3 players)
SB checks, <font color="#cc0000">BB bets t40</font>, Hero calls t40 <font color="aaaaaa">(pot was t160)</font>, SB calls t40 <font color="aaaaaa">(pot was t200)</font>.

Turn: 3[img]/images/graemlins/heart.gif[/img] (t240, 3 players)
SB checks, <font color="#cc0000">BB bets t40</font>, Hero calls t40 <font color="aaaaaa">(pot was t280)</font>, SB folds.

River: 2[img]/images/graemlins/diamond.gif[/img] (t320, 2 players)
<font color="#cc0000">BB bets t120</font>, Hero calls t120 <font color="aaaaaa">(pot was t440)</font>.