I tried this a few times and wondering if there is a bug in jira
So I create a few stories and then create an epic for the stories
I go back to the stories and link them to the epic, using the link and link type "is story of"

I save and it looks right

When I open the epic to verify the link, the linktype shows that it is a bug

Is there some predefined linktype value and it overrides my selected type ?
I know there is an epic link field in a story template but should this not also work ?