Q A is blackjack as far as I know.
Fix your software.
I
As far as I know if you play for example in real life with a dealer then you have a chance to Hit one more, even with blackjack. Should this be different when it is digital?
Probably you are the first site who lets users to hit one more on a "Blackjack" and do Split on a non pair cards as shown on the second image reported by marlboroza. AFAIK, split can be done when user get pair cards only while marlboroza could do split for Q and K. This makes me wonder, is there any new type of blackjack that lets user to do such reported things by marlboroza?
It is better to set your site in maintenance mode first, at least do not accept deposit and real bets until you fix the problem.