I filed my taxes in January, and they were accepted February 12th. There has been no updates and my transcript still shows “no return present”. What’s the hold up?

My “as of date changed from 02/12/2021 to 3/29/2021 yesterday and then changed back to 3/1/2021 yesterday as well. I’m not sure if those dates mean anything. I’ve never had an issue with my taxes and I’m not sure what’s going on.