In the game analysis (I’m white, opponent is black). I move queen, check black, and black resigns. Now I run the analysis, and it states my move with queen was a “mistake(mate in 10) for me white, and suggests a better move. The “better” move does not result in mate. Then it suggests how the game could have continued after my queen move, which results in me white putting black in mate after 10 moves....? Software bug? I took a printscreen but not sure how to upload a picture?
It's not listed as a mistake, it's listed as "Best move".
The accuracy of your analysis depends on the hardware you are running it on. If you run it on a top-end computer, you'll get a top-end computer's opinion. If you run it on a potato, you'll get a potato's opinion.
On my pc I could insert the screenshot below. I understand that the analysis could not be as accurate on an ipad vs PC, however the analysis seem to show the correct subsequent moves, but it's tagged as a mistake and best move recommendation seems not to be aligned/coorect.