We're not sure exactly what that means in terms of the discrepancy. The keys are all coming from the same place, presumably: Funcom. So why hobble the FilePlanet players? Of course, it might just be a way to keep track of which players get to test higher-level content, but one would think that that honor would go to those with a paid FP account, as opposed to the free account holders at mmolecule.
Regardless, the mmolecule contest is live right now for members only; if you're not already a member, sign up immediately and follow the instructions on the site for your chance to win!