PokerStars doesn't use the ">half-bet" limit rule?

[pudley4]

PokerStars 5/10 Hold'em (6 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises</font>, <font color="#666666">1 fold</font>, Button calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">MP caps</font>, Button calls, Hero calls.

Flop: (12.40 SB) 9[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP bets $4 (All-In)</font>, Button calls, <font color="#CC3333">Hero raises $1</font>, Button calls.

This should have been a full raise.

[lighterjobs]

I'm pretty sure it's this way on most sites, IIRC.