I have two WFEs in my environment running SP2010 and FAST Search Server 2010 on a Fast Content Service SSA. There are 9 site collections that are covered in the Content Source of that SSA. I have a file called "uniqueFile.txt" and it's part of the Site Assets of each site collection.
When I run a search for "uniqueFile.txt" it shows 17 results with 16 duplicates. Half of these duplicates are because this same file exists at different locations, however the other half of the results return are pointing to the exact same file twice (Same URL, same doc id.. etc).
I have performed an Index Reset and cleared the Fast Search Content Collection and it appears to resolve the issue, however after a few days the duplicates will re-appear.
Further assistance would be greatly appreciated.