I am sorry for sending everything in multiple messages; I should have thought more before sending the first one.
I just read the thread for FSRS, and found this message.
I might be having the same problem for the same reason; I frequently use filtered decks before exams, where I basically go through each and every flashcard.
(also I just realised that I was probably supposed to post all of this in the main FSRS thread, not on main… sorry about that.)