DTPro seems to change the formatting of some imported web site information.
Take e.g. macworld.com/weblogs/macgems … /index.php (an interesting tidbit about making Safari a better web browser).
I opened this page in DA and in Camino, and in both the page layout was normal. I then selected the text in DA, captured the text with Services>Take Rich Note. When You open the text in DTPro, the layout is different: there is extra white text between paragraphs (extra carriage return), and the bulleted items lists is different (extra bullit lines without text).
I have seens this behaviour on several web pages, not only the example given.