nope, i have red, orange & blue silicone spatulas w/handles, also a yellow hand held scoopy sort of a spatula (without a handle.)
you see this gray color on the spatula(s) when scraping all the remaining icing (after you've transferred the icing into a bowl w/a lid to store.) you see it as you are cleaning any icing clinging to the bowl as you scrape it completely down (so that icing doesn't go down the sink.)
dont get me wrong, i've used KA mixer for 30 yrs. LOVE them & wouldn't recommend any other kind. this one was a gift from my daughter. it's wonderful. before this i've had 2 others (both are still running) neither of the bowls that came with those had that problem. probably nothing to worry about & will try the cleaning process listed in this thread.