Unexpected Refund?

[nativecrafts]

I filed taxes for 2021. I owed huge amount of taxes which I paid directly through my bank checking account. Return was accepted.

Now about two weeks later, I got a check from Dept of treasury (around $500). Says tax refund on the check. It has just a check and no letter explaining what is this check for. 

could anyone explain why I got this check? Was my tax return was audited  and IRS system figured out I paid taxes more than I needed? Will this impact my state tax return which I already filed? 

[fanfare]

IRS likes to send the letter of explanation later, after you get your refund check.