I've had fabrics cut "short" at LQS also.
Like six out of eight pieces. It was only 1/8 to 1/4 inch short, but still - - - - It was $9.80/yard - at that price, I wanted every thread of it I was entitled to.
I like "extra" as much as the next person - but I won't complain if I "only" get what I asked for.
The associate was trying to stretch the fabric before cutting it.
I don't expect 2 ounces extra of hamburger for free when all I requested is one pound of the product.
In fairness to that shop, they did make up for the problem - BUT the store was 30 miles from my home and not on my usual routes.