Hi Icey (and Iciyed!)
This is related to a problem that is currently under investigation.
I just ran into something similar myself - When I opened the Project Browser - all my projects that use URC now had a ‘Sync’ icon (Arrow pointing downwards with a line above it).
If your projects are stored in the default location (Documents/Fortnite Projects) you will not see this problem.
So, I selected a project and clicked ‘Sync’…
The important bit: A duplicate project was created in my non-default projects folder with an underscore at the end (ProjectName_)
Opening the .uefnproject file shows me that the bindings are the same on both, but I just wanted to mention something here so people are not surprised by duplicate projects when they open their projects folder.