the gel dried out, crickets still eat it and it swells in their stomachs..... or at least that is what we think is going on.
There has been at least one death reported also in a dragon who was fed cricket that ate this, in that case they think that the dried gel was either eaten or picked up on the crickets and once they hit the stomach rehydrated and impacted the dragon. The owner of that dragon said the pathology showed a mass blocking the stomach that appeared to be crickets and brown goo. They did not get a breakdown of what it was, so it is really hard to say this was definitely it.
I would never trust any Fluker products anyway, their history with reptiles is not very impressive