Everything else in my word doc is perfect except right at the beginning of the biblio, on the same line as the first ref the text !!ADDIN EN.REFLIST appear followed directly by the 1st author.
Not sure - I can’t quite picture what you are seeing (attaching a screenshot might help?). I would unformat the document (unformat references) and see if there something there? If not try saving the unformated version, closing everything and then reopen and reformat. If you want CWYW on after this procedure, you will have to turn it on again from the format bibliography menu.
You may have inadvertantly (accidentally hit Alt+F9?) turned on show “field codes” in Word, but then the whole document should look weird. Go to tools, options, on the view tab, and make sure that the “Field codes” box is unchecked.