Issue with Ultimate Branding Plugin

I have an issue with the Ultimate Branding Plug-in.

The problem is about Visible Color Schemes. "Branding->Color Schemes" option.

I created a new color scheme, denoted as "flywers",
but if you log in with new non-admin users such as marco (pass. marco) or sofia(pass. sofia) you can verify that the flywers theme is not applied to them.

The site is this:

if members of the support team want to check the super admin panel I can send username and password of the super admin user by mail for further check.