Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

Hero ($111.75)
UTG+1 ($94.50)
UTG+2 ($275.10)
MP1 ($100.70)
MP2 ($60.50)
MP3 ($100)
CO ($287.35)
Button ($0)
SB ($79.65)
BB ($213.55)

Preflop: Hero is UTG with A, K. SB posts a blind of $0.50.
Hero raises to $4, 2 folds, MP1 calls $4, MP2 calls $4, MP3 calls $4, CO calls $4, SB (poster) calls $3.50, BB calls $3.

Flop: ($28) 6, A, Q (8 players)
SB checks, BB bets $10, Hero ???

What in God's name juts happened?