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

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 , you can see if still have the knobs for sale