Overpair on Flop

[domolm]

Had 4 hands all very similiar to this in one session tonight twice with KK once with AA and once with QQ and lost them all... sick variance or am i doing something wrong? should i be laying it down after being re-reraised on the flop?
thanks in advance for the feedback

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">Hero ($16.05)</font>
<font color="#C00000">Button ($10.60)</font>
SB ($31.90)
BB ($12.15)
UTG ($14)
<font color="#C00000">MP ($10)</font>

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img]. MP posts a blind of $0.10.
<font color="#666666">1 fold</font>, <font color="#CC3333">MP (poster) raises to $0.3</font>, <font color="#CC3333">Hero raises to $0.8</font>, <font color="#666666">2 folds</font>, MP calls $0.50.

Flop: ($1.75) 7[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">MP bets $1</font>, <font color="#CC3333">Hero raises to $3.5</font>, <font color="#CC3333">MP raises to $6</font>, <font color="#CC3333">Hero raises to $13.5</font>, MP calls $3.20 (All-In).

Turn: ($20.15) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players, 1 all-in)</font>

River: ($20.15) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players, 1 all-in)</font>

Final Pot: $24.45

Results in white below: <font color="#FFFFFF">
MP has 8s 8h (full house, eights full of sevens).
Hero has Kh Kc (two pair, kings and sevens).
Button doesn't show.
Outcome: MP wins $20.15. Hero wins $4.30. </font>