Cubase changing font size/resolution randomly

Hi Everyone,

I am using Cubase Pro 9.0.40 at the moment.
The problem occurs when I launch some of my vst’s. The Font ratio changes all of a sudden, and some of my effect plugins can’t be tweaked because they can’t handle the change in size. When the resolution/text is normal everything works fine.

I added screenshots to clarify what’s going on:
Any help would be greatly appreciated!