Ah, thank you for the specific report! That actually gives me a good starting point for figuring out what's going on. Next update is a ways out, but this will help :)
Viewing post in Thriller's Bimbo Blackjack comments
Have explored more, and it seems to happen any time you start a new game without exiting the game first. (Changing settings might affect it, will need to test)
The last time, hitting did actually cause it to recalculate to the correct value, though this isn't an option if it incorrectly calculates you as having busted.