[xwiki-users] WYSIWYG editor sometimes adds grey background to text on backspace/delete

Hi, I find that sometimes when I'm editing a page in XWiki part of the text will turn into a light grey background under certain situations. If I have two paragraphs, and I press delete or backspace so that the two paragraphs become one paragraph. One of the paragraphs will have a light grey background. Is there a way to turn this behavior off? Regards, Sunil