Because Groove is directly integrated to your Salesforce instance, it pulls data directly from Salesforce contacts rather than maintaining a separate database. If a contact appears multiple times in a report, Groove will recognize the duplication and ensure they aren’t imported multiple times into a Flow.
If you’re concerned about the number of Flows an individual might be active in simultaneously, or how you can get visibility into which Flow(s) an individual is currently active in or has been active in before, check out the posts below: