Do you mean it did not have 40 pieces of fabric in it? True Jelly Rolls are made by Moda and are 2 1/2" strips of fabric, with 40 (usually different) fabrics in the pack. Occasionally, the line of fabric won't have 40 different prints/colorways and some of them will be doubled up.
However, several people/quilt stores have usurped the term "jelly roll" to mean any related set of 2 1/2" strips of fabric - not necessarily unique, not necessarily 40 in the pack, not necessarily all from the same line, and so on. So always check the description.