the channel store is a mess.
last time I brought this up, my top selling channels got suddenly moved to the very bottom of the list, even though 2 were on the top selling paid list at the time.
As requested, chiming in here: yeah, we know it is kinda borked. Bugs have been filed on things like @BradC's loss of channel ranking. On the device, Game section ranking is now done manually based on a report run once per week, someday when the Game section ranking algorithm is repaired it will go back to automatic rolling 7 day popularity ranking.
i doubt the Co would have maliciously downgraded your channels
So the popularity ranking is done by a recent performance (be it rolling or fixed weekly term) and not since the Big Bang. That may explain what BradC observed.