I would not be concerned with this. The IRS may have made an adjustment or corrected an error on your filing.
You may or may not (due to the small amount) receive a notice from the IRS explaining the change.
-follow this link for additional information-
What to Do if You Get an IRS Notice - TurboTax Tax Tips ...
How long has return been processing? That may be interest due from IRS after April 15, 2021 deadline.
I filed early last week and received the refund today. So I wouldn't think it is interest.
Wow that was quick. Good to hear. I've got to agree with Ray, they'll send you a notice about what it was.