I know there had been an issue before with the quick jumps duplicating on rebuilds but I'm sure that was fixed awhile back.
Just trying to find where they are saved so I can delete and start fresh. Seems that when I generate new even after deleting the files I thought i should I get duplicates, then build again triplicates...
The quickjumps use the artists filters so when you generate you need to have the clear check mark enabled for the genre, artists and years libraries.