Story time!
I once found a fabric at Walmart that I particularly liked for fussy cutting. It was beige with black line drawings of roosters and cows. Fast forward 1+ calendar year and I see the exact fabric from Robert Kaufman at a quilt shop in PA.
An opinion - perhaps some designers may choose to licence their designs for other manufacturers as a separate income stream. The Walmart fabric was not identified as a Kaufman design because it was a lower quality manufacturer.