AQ top pair anc can't fold

[Womble]

Party Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
Hero: $98.30
UTG+1: $83
CO: $76.67
Button: $103.46
SB: $87.01
BB: $100

Pre-flop: (6 players) Hero is UTG with A[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">Hero raises to $4</font>, 3 folds, SB calls, BB folds.

Flop: 3[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/heart.gif[/img] ($9, 2 players)
SB checks, <font color="#cc0000">Hero bets $8</font>, <font color="#cc0000">SB raises to $26</font>, Hero calls.

Turn: 9[img]/images/graemlins/diamond.gif[/img] ($61, 2 players)
<font color="#cc0000">SB bets $10</font>, Hero calls.

River: J[img]/images/graemlins/spade.gif[/img] ($81, 2 players)
<font color="#cc0000">SB bets $20</font>, Hero calls.

Results:
Final pot: $121

What am I to make of the flop raise here. In limit, a raise is easily a Q. The other bets were quite weak which is why I called down.