Hi,
The display issue is just for the icons and comes from some inclusions of CSS files which should not be included in the backend.
<link rel="stylesheet" href="/media/jui/css/bootstrap.css" type="text/css" />
<link rel="stylesheet" href="/media/jui/css/bootstrap-responsive.css" type="text/css" />
<link rel="stylesheet" href="/media/jui/css/bootstrap-extended.css" type="text/css" />
Your isis template already have bootstrap rules in his files ; it does not require the inclusions of these 3 CSS files (which are made for the front-end, not the backend).
The result is that, these files which should not be include, are creating some issues with the "icons" ; HikaShop have some CSS code to handle isis template but it does not have to manage these files which should not be there.
So please check your configuration and check your system plugin in order to be sure that you do not have something which include these CSS files.
Regards,