Cosmetic issue with Floating (undocked) Designer panels?

I work a lot with Designer Panels (Vision Property, Component Panel, Tag Browser in particular, undocked, floating on a second screen like so:

my problem is that, as I am now switching back and forth between Designer for 7.9(.10) and Designer for 8 …
these windows keep on moving around and are resized in 7.9 and end up moving to different screen, physical screens (I use 3 in ||)
this is only happening between 8 and 7.9

if I open ONLY Designer for 8 … my panels are positioned consistently. same for 7.9.
but as soon as I start going back and forth between 8 and 7.9
it’s really messed up
it’s not super important, more “cosmetic” but nevertheless quite annoying.