Hi Josdonners.
I had some issues with CCS also. I found that some of the the options under Settings in CCS do not work with Formidable.
As of now, these are the options I have checked and works without affected my forms code or style:
– Meta Shortcodes
– Enable shortcodes in text widgets
if you have other options checked, disable them one at a time to find the culprit.
This was my conflict with CCS ad FFP. Hopefully this works for you too.
Godspeed.