This issue occurs when the O'Authed Salesforce user does not have access to the field that is being used to filter the report. Since the user does not have access, the filter is ignored when the report is sent by Salesforce to Demandbase. So the resulting audience is the unfiltered report.
To correct this issue, have your Salesforce Admin give the O'Authed user access to the field that is filtering your report. Then recreate the CRM audience in Demandbase.
If the issue persists, please reach out to firstname.lastname@example.org and they will assist in troubleshooting the issue further.