I noticed that on some upper case letters the top part is cut off. It only happens for some letters, like E, B and P, and it does not happen in every application. As an example I added a screenshot when using "Easy Effects"
For posterity, here are my font settings and my system specs:
It's not a known issue of DEs not liking each other, it's purely gtk issue.
Well kde apps doesn't look good on my gnome. Is it also a gtk issue?
Yes.