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why do you think this is related to WPML? I can see the same URL attached to the German version, and WPML does not create that kind of URLs.
If you want to be sure, you can deactivate WPML: if the extra part is still there, is not created by WPML. I think you should check your theme option, permalinks and .htaccess file to see where this URL come from. Or it could also be something created by your provider.