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I believe it comes from too much pressure and perhaps an improper stroke. In the barber manual text on honing found here they go into the X stroke and how to avoid a frown in the section,"Honing...

I have found Sheffield wedges to be tougher to hone then Solingens. Lynn recommends attacking the wedge at a 45 degree angle heel leading on smiling blades and some wedges. I have found that works on...