Graphic issue with 2 monitors Mac Mini 2018

I have graphics problem when drag the plugin in C10 … This happens only when I have connected 2 monitors … When I unplug the second monitor, works fine … I have Mac Mini 2018 i7 model Mojave osx and external graphic rx580, i try with internal intel but same thing

This issue is ONLY in Cubase 10 … I have ProTools 2018.12, StudioOne 4 latest versions . everything works fine

My main monitor is Samsung C49HG9x with resolution 3840x1080 and the second monitor is Asus VX239 full HD 1920x1080

Please see video https://youtu.be/5wVtP2GSxug

Anyone who knows how to fix this

Yes I have that issue too, with 3 monitors. Are you on Mojave?
BTW nice colors of the knobs on your Console 1, is it custom built?

yes, I am on Mojave 10.14.3

p.s. I bought the knobs from some guy in Italy , console1knobs@gmail.com you can see if still have the knobs for sale