Full flop, turn horrendo (deep)

Grabbed by Holdem Manager

NL Holdem $1(BB) Replayer

Hero ($87.80)

BB ($100)

UTG ($102)

UTG+1 ($148)

CO ($100)

BTN ($101)

Dealt to Hero 8:spade: 8:club:

fold, fold, fold, BTN raises to $2, Hero raises to $7, fold, BTN calls $5

FLOP ($15) 8DIAMONd ADIAMONd A:heart:

Hero bets $7.10, BTN raises to $18, Hero calls $10.90

TURN ($51) 8DIAMONd ADIAMONd A:heart: A:spade:

Hero checks, BTN checks

RIVER ($51) 8DIAMONd ADIAMONd A:heart: A:spade: 7:spade:

Hero checks, BTN bets $76 (AI), Hero ???

Mi mano aquí es un bluff catcher unicamente pero lo que más me descuadra de la mano es su secuencia check turn, overbet river... ¿WTF?