How much is missing? If the IRS or state reduced your refund they will mail you a letter saying why. Wait for the letter then ask us again.
The 2 most common reasons this year is you entered the wrong amount on line 30 for the Recovery Rebate Credit (3rd Stimulus payment) or line 28 for the Child Tax Credit. Those lines are just if you didn't already get the full amount or qualify for more. The IRS knows what they already sent you.
