Oh WTF? (FTOPS ME)

[Bond18]

Two hands previous to this, villain raised utg, i called utg+1 with AK all others folded. Flop KT4 he bet i call. Turn X he bet i call, river X he checks i bet 1000 he folds.

Now BVB this happens.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $40/$80
9 players
Converter

Stack sizes:
UTG: $10135
UTG+1: $6015
MP1: $7935
MP2: $4485
MP3: $1013
CO: $5676
Button: $6673
SB: $6431
Hero: $4685

Pre-flop: (9 players) Hero is BB with A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img]
7 folds, <font color="#cc0000">SB raises to $240</font>, Hero calls.

Flop: 3[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img] ($480, 2 players)
<font color="#cc0000">SB bets $320</font>, Hero calls.

Turn: 5[img]/images/graemlins/diamond.gif[/img] ($1120, 2 players)
SB checks, Hero checks.

River: A[img]/images/graemlins/diamond.gif[/img] ($1120, 2 players)
SB checks, <font color="#cc0000">Hero bets $640</font>, <font color="#cc0000">SB raises to $1280</font>, Hero?