most likely the IRS reduced your refund. they should be sending you a notice explaining why. the two most common errors made by taxpayers are omitting the recovery rebate and the other is failing to report the advanced child credit. However, yours could be for a different reason and it's even possible the IRS made a mistake.
you can go on the IRS website to register to review your tax return transcript which should show what the IRS changed
https://www.irs.gov/individuals/transcript-types-and-ways-to-order-them
or call 800-824-1040 - getting through can be a problem but if you do
First choose your language.
Then 2
Then 1
Then 3
Then 2
When asked for SSN do nothing it will ask twice
Then 2
Then 4
if you get through you may be placed on hold for hours and even be disconnected after being on hold
