I don't have any of the experimental features enabled, I also don't have Greenify pro. Do you have auto-hibernation set? Did you give Greenify Root access?
I have given Greenify root access and do have auto-hibernation enabled, and thus far it has been a set-it-and-forget-it app on my phone. Sorry that you are having issues with it.
If you don't have many apps in the list, maybe it would be worth a try to uninstall/reinstall Greenify? Or clear data?