why add slashes with quote ??

When i'm submit the sample on demo web site, the result with quote is good :

src="/components/FCKeditor/filemanager/browse/sample_html/images/pen.jpg"

When i'm submit on my server the result is :

src=\"/components/FCKeditor/filemanager/browse/sample_html/images/pen.jpg\"

how I can desactivate the \ ?

thank you very much for you help !