The template which has been the best selling up until now (because I get no sales anymore), just dropped in ranking by 4000+ templates. Is this normal? What is this algorithm. Or overall, all templates got dropped by thousands???! I am as confused as confusing gets.

The template which has been the best selling up until now (because I get no sales anymore), just dropped in ranking by 4000+ templates. Is this normal? What is this algorithm. Or overall, all templates got dropped by thousands???! I am as confused as confusing gets.