I'm looking at this now. First thing I did was go to your About tab in your league and I see you have "1 Start Per Driver" set for A and C and "2 Starts per Driver" for B. See the image...
I'm guessing you might think that means as in 'Starting Drivers'. Like A1, B1, B2, C1?
That is your driver usage per driver in that group. If you go in to your Commissioner Admin and change it to 8 or 9 or whatever you had, that will fix the issue going forward. I'll do it myself though now so I can rescore your previous two races.
I see in my uninfinite wisdom I'm only showing a 'starts' number in the dropdown equal to the number of races left. I've changed the starts to 9 which should get your entry forms looking right. I'm going to rescore now for races 34 and 35.