I recently cut fabrics for an Irish Chain--and with only one of the fabrics--after cutting a strip and moving it off the mat--several threads got caught on the mat and it unraveled enough in a small spot that I didn't use it! It was a Red Rooster quality fabric. It's not that the threads aren't cut--it's that they stick to/in the mat? I had to be very caereful whenever cutting that fabric. Do you think it's the mat? So frustrating.