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Included Source Codes duplicated with concept_id 0

I’m trying to troubleshoot an issue I’m seeing with the Concept Sets in our Atlas implementation. Attached is a screenshot. The source codes sometimes include one with a valid concept_id along with the same code with concept_id = 0. All of the source codes with conceot_id=0 have the exact same record counts.

Any clues for what table(s) I should look into to find the problem?