nl 50 KK faces strange turn raise from a timmy

[PokerFun007]

Villain is villain is 33/4/.5 over around 40 hands.

PokerStars Pot-Limit Hold'em, $0.50 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP ($17.75)
CO ($84.90)
Button ($37.35)
SB ($28.25)
Hero ($94.80)
UTG ($55.20)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.50, MP calls $0.50, CO calls $0.50, Button calls $0.50, SB completes, <font color="#CC3333">Hero raises to $3.5</font>, UTG calls $3, MP folds, CO folds, Button folds, SB calls $3.

Flop: ($12) 5[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $7.5</font>, UTG calls $7.50, SB folds.

Turn: ($27) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $10</font>, <font color="#CC3333">UTG raises to $44.2</font>, Hero ?