LGC2 42" (3840x2160 - 100% scaling) - Left Display
Acer X27 (3840x2160 - 150% scaling) - Right Display
With the X27 as the primary display, all the icons in my fences group display as normal. (These fences are on the X27 display)

But if I make the LG display primary (Fences are still on the X27 display):

Looks like the fences are scaled based on the scaling factor on the primary monitor. I would expect them to be scaled based on the monitor they are actually being displayed on.