Problems with importing citations to EndNote X

This is the first time this has happened to me.

After saving my “marked” articles and then saving them as a file (including author, title, source and abstract in the fields), I import it into EndNote using the “Web of Science ISI” filter.

The strange thing is that only the “first author” gets imported into the reference in Endnote, all the other authors for some reason are not.

I am puzzled as to why this should be happening?

Kind Regards