Sorry to hear you are having issues. If you mean wallpaper cross fading between the current wallpaper and the next wallpaper coming in. I still see it on my windows 8.1 system with Fences running. But if you have the "Translucent Fence backgrounds (Windows 10 only)" turn on. It might disturb the appearance of the background of the fences.
Stardock Fences configuration windows -> Color & appearance -> Additional Tweaks -> Turn off/ un-select "Translucent Fence backgrounds (Windows 10 only)"
Try that and let us know.
Stardock Community Assistant.