Currently Being ModeratedJan 24, 2013 8:04 AM (in response to Tom10000)
For reference, your feed is at http://erfolg.podomatic.com/rss2.xml
The 15 episodes which appear in the Store and when subscribing are what is in the feed. The usual explanation for this is that the method used to create your podcast - in this case Podomatic - limits the number of episodes shown in the feed, moving older ones to an archive page and out of the feed. There is usually a setting to increase this number, though I can't advise on Podomatic.