A while ago I bought Stan's Notubes system for MTB, I was using it for few days when on a keen curve my front tire mounted off and back on again, after that I was lying on a road next to puddle of Stan's tire sealant. When I got up and checked my bike I found that the tire had lost some air but otherwise everything was ok. I inflated tire and rode it for a while with extra caution.
After few training in one nice sunny morning I woke up because I heard some bang, then I noticed that the tire had mounted off from the rim and all room was with sealant.
Why does the tire mounted off?
Could it be because off soft bead?
Is it possible that the sealant is "eating" my tire?

I'm using Maxxis Flyweight 330 tires and Mavic X618 ceramic rims!

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Light weight everything!

Stan does not recommend using tires that light with his kit.