Sidebar is not displaying correctly

Dear all,

I have a problem with my sidebar.

I have added a widget with the plugin Black Studio TinyMCE Widget. It worked great.

Than, I have decided to suppress this widget. No problem to do it in the dash board, but on the website, the widget is still here!
I can do all the changes I want in the administration area to my sidebar, it works on the administrator side, but not on the visitor side. I have even suppressed the Black Studio TinyMCE extension, but this widget is still apparent to visitors.

What is strange is that the appareance is correct when I am logged in and I visualize the website, but it comes back to the old appareance as soon as I log out (or if I go on my website from another computer).

If someone would like to have a look, it’s the element which is on the upper part of the sidebar, with the picture (here).

The code is even in the source code of the page, but I don’t know where to change this code in my pages…

<li id="black-studio-tinymce-2" class="widget-container widget_black_studio_tinymce">			<div class="textwidget"><p><a href="http://elections-en-europe.net/wp-content/uploads/2014/02/logo-jpg-180x.jpg"><img class="size-full wp-image-8590 aligncenter" alt="logo-jpg-180x" src="http://elections-en-europe.net/wp-content/uploads/2014/02/logo-jpg-180x.jpg" width="180" height="180" /></a></p>
<p style="text-align: justify;"><strong>A propos</strong></p>
<p style="text-align: justify;">Informations sur les élections et la politiques en Europe, aux niveaux européen, national, régional et local.</p></div>
</li><li id="search-2" class="widget-container widget_search">

Thank you very much for your help!

PS: Yes, I have refreshed my navigator. And even started my computer again.