Useless code in source code

Hi,

I found this below useless code in my website source code:

<link rel='stylesheet' id='ub_adminbar_general_styles-css' href='http://mydomain.com/wp-content/plugins/ultimate-branding/ultimate-branding-files/modules/custom-admin-bar-files/css/general.css' type='text/css' media='all' />

I am not logged in and I disabled the outside Braning.

So why is there this code?

Thank you!