I have this same problem. On jomsocial registration page it's just stuck on loading when I hit next https://www.joomlart.com/forums/d/1941-registration-form-stuck-in-loading
smantest Hi Kindly set the default template to Protstar and check if the issue still exist. Most of the times the template make conflict. For more details kindly edit fields in first post and submit the site login for staff.