I seldom buy kits because the one very special kit I bought, had a list of the fabrics with the amount that was included. The kit was short by almost a meter total and one fabric was so small that I could not cut the specific pieces from it. I contacted the company and never even got an acknowledgement. Needless to say, I have never bought another single thing from that company. I think it really depends on the store that puts the kit together.
If you are really worried, measure out what is left of the problem fabric and calculate what still has to be cut. If you feel you are going to be short, contact the company immediately.