You should have received a letter from the IRS telling you why they were adjusting your refund.
If your refund was $3,600 short, it sounds like you have 2 kids under 6 and received $3,600 in advance child tax credit payments that you did not include on your return. If you didn't enter the $3,600, the IRS would have readjusted your refund amount to account for the amount you already received. If you look at line 28 of your return, you will see that is probably says $7,200 instead of $3,600.
If you received half in advanced payments, then you only get the other half of it with your return.
@ezekielalexzander
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