Hyperlinks in form element "Rich text (with placeholders)" are in a strange format

Hi!
When creating a hyperlink in the form element for "Rich text (with placeholders)", the hyperlink looks like this when viewing source: <a href="/link/58d2861443a64c53a2a03bb94ec4556a.aspx">My hyperlink</a>, but when viewing source in Firebug it looks like a friendly Episerver url.
We use SiteImprove that says 404-page not found on the url /link/58d2861443a64c53a2a03bb94ec4556a.aspx.
What can I do regarding this? Is it a known bug?

Best regards Kristian