Server player average stays at 7 while my peak is over 30 with a low of 5 yet the past week the average was stagnant at 7 causing the rank to fall. I check server rankings above my server that show as few as 5 player average. What gives?

Current rank is calculated once per day based upon the previous seven days.

The average number of players reported on the server page is the monthly average; Average (past month): 8

Mystery solved.

Perhaps but yet another mystery has manifested. The last 30 days ranking was stuck at 729 and now that I posted it jumped to 716!
Yet the 339 position above me had 6 average with roughly the same player average for day.
Mystifying? You bet!

My original response stands as the answer to this also.

Think about it - it will come to you