References imported from Pubmed inserting as field codes only

I referenced half of a document using somebody’s enormous, terribly formatted Endnote library with triplicate references. Having put in the references I needed, I ditched that library and exported the references from Word into a new library, saved them under a new library name.  I then imported a bunch of references from Pubmed into this library. Any time I try to add these Pubmed-imported references into Word with CWYW they come up as unformatted curly bracket field codes - no amount of hitting ‘Update Citations and Bibliography’ fixes it. In Word these citations are ascribed as ‘Travelling Library’ compared to the ones I’d already inserted.

What am I doing wrong? This is wasting me so much time :frowning: