The following feed shows strange articles:
http://www.miasanrot.de/feed
Some of the articles are just garbage, some seem to include parts of a “real” article and on others the German umlauts (äüö) are displayed incorrectly which doesn’t happen on any other feed. You can figure out the nonsense by trying to open the articles in the Original view or by opening them in a new tab/window. This fails for all the data garbage articles like “Al.teuasctrafrigeschhthalke”.