I’ve found a great big bug for you
I suspected this might be the case, but now I have the proof!
When you are doing reviews and you hit the next hour, if you are during the wrap-up stage, you get a load of new items added to your reviews, and then every correct answer you give iterates the number of items left to be wrapped up down by 1, regardless of whether you’re actually wrapping them up from the previous hour or they are genuinely new reviews from the new hour.
e.g. I hit the hour during a wrap-up, then get the 1 “wrap-up” review correct, then answer 1 genuine review correctly and get this:
Then I answer another review correctly and get this:
etc.
Incidentally, the review session always seems to auto-terminate when you get to “-10 to go”.
Does it make sense?
I can have another go at explaining if it doesn’t.