It's impossible to tell from a web photo, but it looks to me like there are several places where the lattice is not a consistent width and do not meet at consistent 90º angles...it could simply be the way it hangs and the camera angle. Only you can tell for sure with a ruler and a square edge. Also check the long lines with a yardstick to see if they warp at all.
Use the comment as a learning experience, not as a criticism, and your next quilt will be even better.
Please do not stop submitting quilts for judging comments just because you got one you don't understand. Have you asked the show coordinator for clarification? She/he could possibly get that from the judges for you even after the fact.