How come when I select a tile under User it unselects

For all who are watching this thread. Support was able to provide a working solution to my issue. Turns out that the sample files that were not allowing me to set a Vendor on were corrupted somehow straight from the sample provider I purchased them from. All I needed to do was export each of them as a new wav file and overwrite the ones in the directory. Then I was able to set the Vendor to NI. No more "Other" Vendor tile AND no more selection jumping back to the first row either when in "All Vendors" mode.