Hi, this occurs if you open the homepage template live on the site via the page template.
The editor within the admin console will wipe out this code "data-orbit" once you save the template.
<ul data-orbit> (about line 28) on the homepage template.
It looks to be the way the editor is trying to keep the code clean - it does not recognise this as valid code so cleans it out.
Suggest if you can, to open the template using DEVELOP mode if accessible (this works) to you or edit it offline then upload.