I think you must be talking about the spellchecker in the wysiwyg editor that underlines words it thinks are misspelled. You can ignore that, its just to draw your attention to what the editor thinks might be a misspelling. If you right click a word it has underlines it will show you spelling suggestion. ie as I'm posting this both "spellchecker" and "wysiwyg" are underlined. Nothing to worry about, ignore it.