I had a similiar problem. Took the last of a bold (6+yards) of bridal satin. For some reason the clerk put the ticket in as 6 yds, then a second entry of the 7/8 yards. So my 40% off coupon only rang on the 6yds not the full bolt. I didn't realize until a week later when I turned the receipt in to my school (I'm making stoles for graduation). NO idea why the clerk put one piece of fabric in as two entries. I'll be VERY careful next time!
When will they get their act together!?????