Frequency rating R2

I increased the frequency on the route TXL-LHR from 28 weekly to 42 weekly (all MD-81, if that matters), and yet the rating for the flight frequency decreased from 80 to 70.

I also tried to reproduce it on a new route. I opened TXL-CDG with 28 weekly flights, and the rating was 80. Then I added 14 additional flights, and it went down to 70, as before. Closing the 14 flights brought it back up to 80, and adding them once more back down to 70.