The secondary object in a Salesforce report's cross filter displays the Related List Label of the child object's target field.
If two child objects share the same Related List Label on their target fields, both objects will display with identical names in the secondary object dropdown of the report's cross filter — making it hard to tell them apart.
This article explains how to fix duplicate object names appearing in the secondary object dropdown of a report's cross filter.
To resolve this, rename the Related List Label on the child object's target field:
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