Not counted toward monthly contest?

[Dessa]

I worked really hard all May to get into/stay in the Hall of Fame lists, and to get as high as I could. IIRC I was sitting in 13th on the High Score list, and 19 on the Fastest Time list. I know that my average time was 228.something for the month. Even so, I was completely skipped over on the two lists, and I see people who had lower average times than me on the top average time list. What's going on?