When trying to rearrange issues in the backlog or in Work mode, an error is displayed and it is impossible to reorder issues.

Error message: "JIRA Agile cannot execute the rank operation at this time. Other users may be ranking the issues that you are trying to rank. Please try again later."

How to verify:
When running the following query on the Jira database:

SELECT "FIELD_ID", COUNT(1), "RANK" FROM "AO_60DB71_LEXORANK" GROUP BY "FIELD_ID", "RANK" HAVING COUNT(1) > 1;

1 or more lines are returned with duplicate ranks.