I use joomla 3.10.11 and seblod 3.23.1. The template is gantry 5.5.15
The problem has changed to:
I created a 6 page form. Configuration: stage 6. Each side 1 field and a next button.
The first page is displayed, click on next - the form stays on page 1 and does not change to page 2
1. Stage: textarea
2. Stage: radiofield
all other Stages: textfields
Access: Public
Permissions: Public - create, edit, edit Own: Allowed