Weak call in flop to 3bet raise?

PokerStars - €0.02 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (SB): 105 BB
BB: 107.5 BB (VPIP: 17.24, PFR: 10.34, 3Bet Preflop: 14.29, Hands: 29)
UTG: 135 BB (VPIP: 44.44, PFR: 11.11, 3Bet Preflop: 0.00, Hands: 57)
MP: 121.5 BB (VPIP: 76.92, PFR: 33.33, 3Bet Preflop: 7.69, Hands: 40)
CO: 181.5 BB (VPIP: 25.37, PFR: 14.93, 3Bet Preflop: 4.35, Hands: 68)
BTN: 27 BB (VPIP: 100.00, PFR: 33.33, 3Bet Preflop: 0.00, Hands: 3)

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has J♥ J♣

fold, MP calls 1 BB, fold, BTN calls 1 BB, Hero raises to 5 BB, BB calls 4 BB, fold, BTN calls 4 BB

Flop: (16 BB, 3 players) 6♣ K♣ 2♣
Hero bets 10.5 BB, fold, BTN raises to 21 BB, Hero calls 10.5 BB

Turn: (58 BB, 2 players) 2♥
Hero checks, BTN bets 1 BB and is all-in, Hero calls 1 BB

River: (60 BB, 2 players) 8♦