We've tried to reproduce this issue on a local test instance of ours and we found that this is a bug that appears to happen when creating an epic from the backlog:
We recommend you to vote the issue so our devs can fix this bug and prioritise over other bugs, and to please watch the issue so you can get all updates on the bug. The bug will be fixed in accordance with our Server Bug Fix Policy
Apologies for the inconvenience on this!
Thanks for your understanding.
I have the same problem.
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If you look at the first answer by @TP there is an open bug for this which you should watch and vote for.
One of our developers found that to work around this issue just make sure you aren't creating epics from the backlog view of the sprint board and it should work fine.
Hope that helps!
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