I have found a issue with the Contentfilter: MakeUrlsAbsolute in some of the latest builds example: 2016.3.1027 (latest) and 2016.3.914.45
The issue occurs when the link is same as the url the editor is in. Try this html in your demo.
Last version we used were it was working is: 2015.1.401.35
And that will end up as: (when switching between html/design-mode)