Do you think perhaps the fabric was "counterfeit"? If you got it on the internet, someone may be trying to pass off cheaper foreign fabric for better known brands.
On the other hand, I find some Kaffe Fassett fabric really thin and soft, which would be great for clothing, but not so much for quilts.
You could take a sample and give it some rough treatment, like a year's worth of wear and tear, to see how it acts, before you put it in a quilt.
By the way, welcome to our fun forum!