We don't know that Steef hasn't been being 'affected' by the Vykkers. In the X-Factor video, when Lorne is explaining to Ed Fries about the changing Steef appearance, he did talk about doing testing on the horns, although whether he means with the design and 3D construction or in the story, I can't quite tell. With Vykkers about, it's difficult to be sure.
Besides, Steef has to disguise himself somehow.
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