I've noticed recently that when downloading a book from a Millennium catalog (from III), the full call number doesn't download. For example, if the call number for the book was LB1028.5 .N54x 2003, Zotero only downloads LB1028.5 I've checked this out on other Millennium OPACs besides ours and it's doing the same thing.

This is a fairly recent bug, as I see records I've downloaded from Millennium from earlier in September which have the full call number listed.