I'm not having that issue, but something very odd that I have seen on my 'part time' mining machine.
My Ryzen 1800x mines way faster than the GTX980 that's in there. lol.
lol similar situation here. My Ryzen 1500X sometimes performs better than my 1050Ti.
On another note, for the WinMiner staff, regarding the update. Kudos to you, keep up the good work! Any chance to see any of my suggestions being realised someday in the future? Best regards