I solved this by Deleting the "cache" folder which is the App_Data
folder.
The site rebuilds this index. There must have been duplicates in the App_Data folder, clearing this folder solved the issue for me.
Duplicate nodes for everything in umbraco admin dashboard
Question
Suddenly we have duplicate nodes of EVERYTHING on our admin dashboard, what gives?
I checked the DB, there are no duplicate published=1 nodes. Using Umbraco 6.1.6
Solution
Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow