Nintex Form not showing on New Item

If you experience it where you have customized the capture screen of a SharePoint list using Nintex Forms and the default SharePoint form still opens instead of the Nintex Form you might be using a custom New Item form.

Open your list using SharePoint Designer and make sure the NewForm.aspx is set as the default form on your list. Nintex Forms will only display if this is set as the default.