Issue
When downloading a file, the following popup is shown.
Cause
This only happens in Chrome, and according to bits of noise in (Non-Apex) forums it is because of a comma in the filename.
I had a comma in my report title.
In my case, overriding the filename or putting a filename in commas had no affect.
Solution
Remove the comma from the report title
Acknowledgement
https://stackoverflow.com/questions/13578428/duplicate-headers-received-from-server
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