So weird, I just opened up my PM with Mike and hit "reply" and my scores that I entered (but never submitted) popped up and said my reply was "restored".
Apparently the PMs reply box will "time-out" just like entering a reply to a thread, so if you keep a reply box open too long, it won't submit it even if you hit submit button. It just clears it. Then when you re-open the reply box, it shows the text again.
Ah well.
In any case, these are the grades I had entered (but got timed-out) and never submitted.
Chilling Tales #13 4.0
Diary Secrets #30 3.5 +3
Horrific #3 2.5 +1
Doctor Solar #1 5.0
Avengers #7 7.5 +1
Dang. This would have been good round for me if I had actually submitted the grades and they didn't get timed-out.
Lesson learned, don't hold the PM reply box open all the while you're examining and grading each book. It will time-out and not be submitted even if you hit the submit button.