Hello and thanks for reaching out 🙂
What you are experiencing definitely sound strange, but we are unfortunately unable to support these types of conflicts per forum rules :-/
I also did a quick check of past forum threads and didn’t see anything relating to what you’re experiencing, so I’m really not sure where to start. You may want to try contacting the author of the Custom Field Suite plugin to see if they have any ideas.
Sorry I don’t have a better answer for you at this time. Thanks for understanding and good luck resolving the issue.
Cheers!