I requested Epics, but the result returned shows many types of issues and not only Epics

Problem

I wish to display a traceability report for Epics, and the result returned by Impact shows not only Epic, but issues from all types. 

Solution

Please make sure you did not use the Issue Link Types option to filter Epics to be displayed, as in the figure below. 

You must remember that the JQL query returns the first level issues from which the traceability analysis will be done. In this example, the user requested ALL the issues in project TE. Therefore, all issues will be considered first level issues and the analysis will be done on ALL of them (including Epics). Make sure you filter only the issues types requested : Epic in this case. 

Now, selecting Epic links will display issues showing this type of link (and hiding all other issue link types, such as duplication, blocks, verify, etc.).