How can i remove the first apperance of the wiki edit screen above the site head

Hello, I installed the plugin and made no changes to the plugin or the theme. The wiki displays fine (in the content area). Once you click edit/create, you see a full page edit screen, if you scroll down, you see another version of exactly the same ui but this time in the content area. Is this the normal behavior? Is there a way to control where and how the ui is displayed?

The link to the wiki is : http://my.cdim.it/kb/web-design/

To trigger the problem, click on the edit button.