Its normal. Don't sweat it.
Be aware that grease isn't the best possible lube for this application. Search rec.bikes.tech for lots and lots of threads about this. I use PW tenacious oil in my Mavic hubs. I've heard the special Mavic oil is just 10wt mineral oil.ejeaston said:Anyways, the cassette body came right off & got it lubed up with some white lithium grease & it seams to be working well.