I think you are talking about this theme https://www.opendesktop.org/p/1226052/. He already
posted an issue The “downloads today” counter details decrease when with no reason he’s theme achieved 1700 downloads and after 2 days it had less than 100. Today it has 8500???
I think all previous weird download changes were due to the new rating system. But downloads are now getting more stable again, and having more than 2000 downloads is really difficult, so 8500? 
what?