When I use the 'Jira for Excel' add-in I sometimes get duplicate rows in my target sheet. Even when I clear everything in the sheet before reloading data from Jira, the plugin returns duplicate rows.
It isn't just random duplicate rows; when there are duplicates, it is consistently the complete results appended consecutively in the sheet.
An additional oddity is that the results are sometimes correct, and it is one result, but sometimes it is two complete sets and even four complete sets of the results.