If you click a link and the page you are on scrolls instead of going to the linked page, this is because the link points to a page that is also used as Content Reuse on the same page.
The link is supposed to hyperlink to the content, but instead converts to an anchor link and scrolls because the content is already on the page via Content Reuse.
To resolve this:
Example:
Before without rel="custom":
<a href="/page/url/example" title="Example">Hyperlink Text</a>
After with rel="custom":
<a href="/page/url/example" rel="custom" title="Example">Hyperlink Text</a>