Different rules over at Prima?

[GoCubsGo]

Is this rule dependent on the site you play at, or do I just not understand it correctly? No hand converter, but you only have to look at 3 lines.

** Game ID 519484213 starting - 2005-09-29 22:26:41
** Revolver [Hold 'em] (0.50|1.00 No Limit - Cash Game) Real Money

** Dealing cards to me: 4 of Clubs, 5 of Clubs...

Flop not important

** Dealing the turn: 2 of Hearts
HOLDEMKING30 checked
I checked
ibbotsoni bet - $10.00
HOLDEMKING30 went all-in - $10.10
I called - $10.10
ibbotsoni raised - $29.60

Isn't that not allowed because nobody raised at least 2x his bet? I'm kind of pissed about this because I wouldn't have called otherwise. I don't think a major poker site would have an error, so is it just like this at Prima or have I never understood this rule correctly?