i just realized that the fog in my scene creates some artefacts, if rendered in stereo sidebyside.
What you see is a small testrender to figure out where the problem is located. In my original scene it matters, because the shown part is much bigger!
As you can see everything renders fine, if i render stereo and the fog is deactivated OR if i render with fog but in mono.

As you might notice the atmosphere is not the same without the fog.
Is this problem known?
Anything i can do to get a solution?
Thank you for your attention, Chriz