Other Things to Check:
Are you on the latest version if WordPress?
Are you on the latest version of Ninja Forms? Ninja Forms is updated frequently with bug patches, security updates, code improvements, and new features. It’s always best to be on the latest version of Ninja Forms.
Are you on the latest version of your Ninja Forms Extensions? Extensions are updated with new features, bug fixes, and to ensure compatibility with the newest version of Ninja Forms core plugin. And old version of Ninja Forms or extensions can definitely cause unintended results. You can check your particular extensions to see if you are on the latest version.