When you started to enter the dependents the "stimulus" for a dependent might have started to kick in. But you cannot get stimulus money for claiming adult dependents. So when you entered more information the "refund" disappeared.
All you get for claiming those adults is a $500 credit for other other dependents for each one--which can reduce the tax you owe. It is not added to your refund. And they do not receive stimulus checks since they are claimed as dependents---so be very sure you can really claim them.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
https://ttlc.intuit.com/community/children-dependents/help/what-does-financially-support-another-per...
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