This is one of the reasons the fields are locked. You should not apply those fields to anything other than the Epic issue type. JIRA Software expects only that issue type to be set up as an Epic, and things *will* break in interesting ways if you achieve any of what you've just said.
Do NOT hack the database either - unless you are *absolutely* certain of what you are doing, you will break things, and actually, you've been lucky here in that JIRA is repairing some of the damage you've been doing.
I appreciate it, however I don't feel lucky ;)
In the other installation those fields managed to get linked to the Issuetype 'Epos' which is just Epic in a different description.
However I seem to be unable to rename Epic to Epos to make the configuration match.
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Well I managed to get around it, by deleting the Issue Type Epos, so I could rename Epic to Epos. (Thankfully otherwise empty instance.)
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