Translation in site not working / confusing

I really don’t understand, what’s happening in my multilanguage setting. I created a field (with events) within the site settings. Creating an event in english (default language) will workk pretty well, translate it in german langage will update the language file. But this is strange: The german front-end and panel will only display the english values no matter whats saved in the file. In short: I can’t use the translation with this structured field. What is wrong?

Do you any plugins? Which ones?

Sorry for the late answer. Yes, the plugin sitemapper was causing the issue. Thanks for the hint.