Have you tried hitting F5 on your Zammad website? That often helps refreshing things.
Otherwise you still might have a problem with the permissions. You could post a screenshot
if the groups don’t appear on the customer interface:
did you check customer_ticket_create_group_ids or on Zammad UI Settings(Admin)->Channels-Web->Group selection for Ticket creation
irb(main):001:0> Setting.get(‘customer_ticket_create_group_ids’)
=> [“6”, “18”, “23”, “12”, “15”, “9”, “17”, “104”]
Your group ids should appear here