I used to cut fabric for Hobby Lobby and (ironically) Walmart. It was at WalMart where I learned that if you cut fabric with lines in it (like plaids, or quilt panels) that you have to cut one side of the fabric at a time.
I understand that it's really freaking time consuming to cut it on the line like that, (used to hate the quilters who'd come in 5 minutes before I was supposed to go to lunch, pull down 30 bolts of plaid and ask for forty-five 1/4yd pieces) But it really needs to be done this way.
I know some people reading this are going to think I'm an anal retentive bitch, but if you've ever worked with plaid fabric you'll understand.
Now I have to go up to WalMart, bitch to the manager, and see if they'll re-cut it (and hope that they still have the same fabric in stock).