I think it's more the line than the store a fabric is purchased from
I made a blue and tan quilt about 20 years ago - the fabrics were ALL purchased from Northwest Fabrics (no longer in existence) - 13 of the 14 fabrics still look pretty good. One navy one with stars is totally faded and looks about 30 years older than the rest of the quilt.
I usually wash ALL of the quilt at the same time and with the same method. Have no idea why just that one fabric faded so badly.