If you are getting the $500 credit for other dependents that means you claimed your 26 year old son as a qualifying relative dependent. Did you mean to claim him? Did he have over $4350 of income himself in 2021--not counting Social Security?
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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