Worst beat I've witnessed in HL, NL

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Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is SB with J[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, MP1 calls, MP2 calls, <font color="#CC3333">MP3 raises</font>, <font color="#666666">2 folds</font>, Hero calls, BB calls, UTG+2 calls, MP1 calls, MP2 calls.

Flop: (12 SB) 6[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
Hero checks, BB checks, UTG+2 checks, MP1 checks, MP2 checks, <font color="#CC3333">MP3 bets</font>, Hero calls, BB calls, UTG+2 folds, MP1 folds, MP2 calls.

Turn: (8 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, BB checks, MP2 checks, <font color="#CC3333">MP3 bets</font>, <font color="#CC3333">Hero raises</font>, BB calls, MP2 folds, MP3 calls.

River: (14 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">Hero 3-bets</font>, BB calls, MP3 calls.

Final Pot: 23 BB

Results in white below: <font color="#FFFFFF">
Hero has Jh 7h (four of a kind, sevens).
BB has Qd Qs (full house, queens full of sevens).
MP3 has As Ac (full house, sevens full of aces).
Outcome: Hero wins 23 BB. </font>

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WTF?.... How the [censored] can anyone have Queens and not raise, hit top set and not raise, hit a full-house on the turn and not raise?