It wasn't a loss. It was a no action.
Bets involving totals (both teams totals) or team totals (one teams total), must play usually 8 innings or more, varying slightly by sportsbook or it is a no action (push).
Read the rules on any sportsbook and you will see this. Does seem a little unfair in this particular situation though.
As this occurred, I KNEW it would be declared a no action. But I checked shortly afterwards and was pleasantly surprised to see it graded as a win. 20 minutes later I received an email telling me the game had been re-graded as a push. And when I checked the account, sure enough it has been changed.