If you grade a non-volume 1 book in the temporary grading phase and you do not reach a ‘graded’ status it will revert the difficulty rating to the initial level on the hour, such as @Belerith’s grading of vol 7 here. I manually fixed this one.
Now, this bug will not have any permanent issues… grading in the temporary state is completely recalculated each grade and it does factor in grades from all volumes in the series (if the book is apart of a non-variant series). This means that when we receive more temporary grades it acts the same as if this buggy reversion hadn’t happened.
But, it would be good to fix as some books hang out in this temporary phase for a while