The IRS will be sending you a letter within the next two weeks.

Why is my refund different than the amount on the tax return I filed?

All or part of your refund may have been used (offset) to pay off past-due federal tax, state income tax, state unemployment compensation debts, child support, spousal support, or other federal nontax debts, such as student loans. To find out if you may have an offset or if you have questions about an offset, contact the agency to which you owe the debt.

We also may have changed your refund amount because we made changes to your tax return. You’ll get a notice explaining the changes.  Where’s My Refund?  will reflect the reasons for the refund offset when it relates to a change in your tax return.

https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions