Posts list doesn't display links

I have a site built with Make that is supposed to show blog posts with a particular category using the posts list tool in the builder. What happens is that links I have entered in the individual posts don’t show in the posts list section on the main page.
Check it out for yourself: here is a post with a link inserted in the text:
http://www.weltladen-akademie.de/gladenbach-fair-essen/
The pdf linked shows up and the link works properly. Fine.
Now watch the main page which contains the posts list element:
http://www.weltladen-akademie.de/best-practice-test/
You can see the post (title, summary, categories). And you can see the text that actually is a link – unformatted. No link.
This seems to be a bug – or is it a feature?
Please let me know your thought. Thx!