Duplicates in webinars Participants Report

We use Zoom Webinars a lot. Attendees report tend to include several duplicates names. That is why we used Participants Reports (with the boxes for “Export with meeting data” and “Show unique users” checked) to get a report without duplicates names. Not any more. Recently we noticed that Participants Reports is generating duplicates as well although not as many as in the Attendees Report. 

How can we eliminate duplicates in Participants Reports?