($24) JJ in BB facing some strange moves on the bubble

[Pocketbear]

BTN has been limping quite a lot from the button, SB has been pretty active but I'm not sure I've seen him minraising before.

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t60/t120
4 players
Converter

Stack sizes:
UTG: t5740
Button: t2780
SB: t3190
Hero: t1790

Pre-flop: (4 players) Hero is BB with J[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/club.gif[/img]
UTG folds, Button calls t120 <font color="aaaaaa">(pot was t180)</font>, <font color="#cc0000">SB raises to t240</font>, <font color="#cc0000">Hero raises all-in t1790</font>...

Standard, right?