I have just bought a Shadez tanning machine, and done my first tan- very well actually! but the cup is leaking tanning solution from the top where it twists on... I've tried twisting it tighter, and I've been really careful to ensure the seal is secure, but I'm still getting tan everywhere! Has anyone else had a similar problem? If not I'll have to send it back but they're so slow at delivering I'd rather try to rectify the problem first...