Help! Changing bibliography format - dozens of references disappear!

This happens to me every time I am reformatting the bibliography in a Word document that was sent to me for review.  I need to change the format based on the journal to whom we are submitting the article.  I click on the icon for reformatting the bibliography, I choose the journal style we want, and then click ok.  It looks great – except that I only get 28 references and the rest (in this case 70 additional references) just disappear.

I’m really in desperate straits on this.  Otherwise, I have to completely reformat all of these personally in a short time.  What should I be doing?  Help!

I’m sorry; I’m a newbie.  I should have added that I’m using EndNote X.0.2, Word 2002, and this document has the references attached as a traveling library (they are not resident in my EndNote libraries).