On the mobile version of the site, in the settings for editing participant roles, you can remove(and add?) the default “member” role. This role, of course, is not actually removed, and after reloading the page it is also displayed.
This problem does not exist on the PC version.
The problem is very minor, but quite funny.
Demonstrations:
Problem(mobile version of the site):
PC version of the site:
Expected behavior
This role should be non-removable (there should be no add/remove button) as on the PC version of the site