PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Converter Tool from (Format: Bet The Pot)

UTG ($39.95)
MP ($26.50)
CO ($15)
Button ($15.25)
Hero ($29.80)
BB ($19.65)

Preflop: Hero is SB with , .
1 fold, MP raises to $0.75, 2 folds, Hero raises to $3, 1 fold, MP calls $2.25.

Flop: ($6.25) , , (2 players)
Hero bets $3.5, MP calls $3.50.

Turn: ($13.25) (2 players)
Hero checks, MP bets $8, Hero calls $8.

River: ($29.25) (2 players)
Hero checks, MP bets $12 (All-In), Hero calls $12.

Final Pot: $53.25

Results below:
Hero has (two pair, queens and jacks).
MP has (one pair, jacks).
Outcome: Hero wins $53.25.

LOL @ suckin out obv too

Question: Why did you give up the lead on the turn only to donk-call it down?