Could be lots of reasons. The IRS will mail you a letter. Probably nothing to do with your children. I've been seeing if you have self employment income and self employment tax that is deferred they have been taking it out of your refund.
See if the tax is listed on 1040 Schedule 2 line 4 which goes to 1040 line 23. That was being deferred. And now the IRS is saying you can't defer it.
The self employment tax deferral is an optional benefit. It is also a deferral rather than forgiveness, so those amounts will eventually need to be repaid. Half of the deferred amount is due on December 31, 2021, and the other half is due on December 31, 2022.
Check if you have a Schedule 3 line 12e which goes to 1040 line 13.
