[xwiki-users] WYSIWYG editor: Title 1 formatting generates html syntax instead xwiki syntax

I have just installed XWiki, which I think is a great tool from what I have seen until now. However I'm experiencing a quite annoying problem: the WYSIWYG editor from my instance of XWIKI doesn't behave like the one from the playground instance: 1. when I select a text and mark it as "Title 1", it generates "<H1></H1>" instead of "1" 2. the wysiwyg editor doesn't display the horizontal line below the text (as it is displayed when the page is viewed). I saw that the demo version from playground.xwiki.org displayis these bars while editing a content. Perhaps there is some configuration that needs to be changed? Thank you in advance for your answer. Cristi.