$100NL Postflop with KK

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Villain is 53/14/3.5. What just happened here? Is calling standard?

Full Tilt Poker
$0.50/$1 No Limit Hold'em Ring Game
8 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
BTN: $107.65
SB: $99.5
BB: $116.55
UTG: $72
UTG+1: $132.30
Hero (MP1): $137.60
MP2: $108.40
CO: $85.55

<font color="black">Preflop:</font> K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] ($1.5, 8 players)
UTG folds, <font color="red">UTG+1 raises to $4</font>, <font color="red">Hero raises to $18</font>, MP2 folds, CO folds, BTN folds, SB folds, BB folds, UTG+1 calls $14

<font color="black">Flop:</font> 7[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/club.gif[/img] ($37.5, 2 players)
<font color="red">UTG+1 bets all in for $114.30</font>, Hero?