The mill is not the ones that get fabric on the bolts misaligned and pulled off grain. It is the distributor. The mills send the fabrics on 3000 yard rolls. When the distrubutor receives and bolts the fabric on 15 yard put ups, this is when the fabric gets pulled out of whack. As the fabric is rolled around the bolt and the fabric builds up, it starts to get pulled more to one side than the other. When the fabric store receives the bolt, and doesn't correct this right off, the entire bolt can be cut off kilter, causing each cut to be 2-4 inches off. Most fabric stores are not very knowledgable about this fact, so don't square up their bolts first hand.