I received an email from HR for next interviews at wells fargo after 3 rounds. What is that about?

You want us to guess without giving any context about the initial 3 rounds. lol . Ask your recruiter directly

Talk to your recruiter. Always the best advice in these scenarios

It means they feel they can drag you along for a fourth round. If it is someone new this could be good. If higher level person, very good. If peer of you or hiring mgr it means they like you but aren’t sure you could do the job so double checking.