Did you recently fill the rear with oil or did this suddenly start without you touching anything?
There is an overflow vent at the bottom of the outer case that it might be seeping from if you topped it off recently.
I had a little bit of that going on also, though not quite so much. I just took the rear wheel off and cleaned everything out. There was some liquidy<---- word? grease floating around in there . I put it back together with just a little moly paste on the wheel splines. Now I will just watch to see if it happens anymore. It's an easy job.
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