Yes I'm 100% positive it was done counting. My total bonus round win was $1792.90 which is still way below what you've calculated. Is there any chance the win is calculated using the average bet, however unlikely?
No it's not an average bet slot so there's something wrong here. You should ask Ben for a screenshot of your win.
Edit: It looks like the middle symbol (whatever it is) win is "missing" and you only won 81 x the car and 81 x the couple. Something's definitely fishy.