Hey Liviu!
Give this issue a look-see:
https://jira.atlassian.com/browse/JSW-13456
And I know that you're not seeing this issue on a Service Desk project, but check this as well:
https://jira.atlassian.com/browse/JSD-3385
Basically, the workaround is to remove (or rename if in use by other custom project) issue types "Story" and "Epic" and create a new project. The issue types will be recreated automatically.
Good luck!
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