The issue occurs because, in Mainframe, one single Analysis Unit, has several projects (COBOL, JCL...) with the same name.
As a workaround,
1. If you only want to search in the Cobol side, you can add the filter to search only in Cobol -
2. If you want to search in both Cobol and JCL, then you need to create 2 reference finders - one for JCL and one for COBOL and filter based on the languages.
3. If the problem you are facing does not match any case listed in this page, report your problem to CAST Technical Support and provide the below Relevant input for CAST Technical Support to reproduce the issue.