Wiki Pro and DIVI Theme: No comments

Hi there

I'm using DIVI Theme from Elegant Themes and WIKI Pro.
Unfortunatelly, I can't see and enter comments in the front end.
Switching to another theme like Twenty Sixteen and everything is ok: Comments part is visible and works well.
It seems to be an incompatibility with Divi theme.
Can you verify this and perhaps fix this?
Thank you very much,
Frank