@werdi I don’t think it has anything to do with Soundcloud/Vimeo.
When you hover a little bit above ‘Video’, you’ll see the mouse pointer change. If you click there, you will jump to the #video anchor.
The difference between both pages is the empty div <div id="header"></div> versus <div id="vita"></div>. They are defined just above the submenu. The div with id ‘header’ has css attached, while div with id ‘vita’ has not.
The attached css is intented for the real <header> which also uses the id ‘header’. By the way, Ids should never be reused.
which creates an empty div with the value of 'module.menu' as id…
If that module has a frontmatter with ‘menu: header’, an empty div with id="header" will be generated.
Since the designer has defined css for <header id="header">, the new div with the same ID will also use that same css and hence the layout of the page gets ‘confused’…