Rating reset

It doesn't seem that this is the case. I glanced over your profile. 2.7k games in total. I looked at your recent games, and they extend far past a couple weeks. Perhaps your app or browser had a problem rendering something?

https://www.chess.com/news/view/10-minute-chess-now-rapid-rated-bullet-ratings-increased
10|0 games are now rapid, not blitz. Be sure to check your rapid rating. Your past 10|0 games are still classified as blitz.
Playing with the iOS app? There’s an updated app version which fixes a related bug.