Ideally JIRA doesn't make it possible when configuring screens to add fields to a tab, if that field has already been added to another tab on the same screen. However, it appears that in some rare case of database integrity issue, where a field occurs in more than one tab of the same screen, JIRA is unable to detect this situation or correct it automatically.
To fix this, refer to https://confluence.atlassian.com/jirakb/createissuemeta-returns-duplicate-key-error-872016885.html
Ultimately, vote for this feature request https://jira.atlassian.com/browse/JRASERVER-43467 in order for integrity checker to have a checking on this duplicated field on screen tabs as well
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