Footnotes suddenly bloated with data from unwanted fields

I turned in my book ms to my publisher awhile back and everything was fine. But when I got a PDF back from the copyeditor, the footnotes were full of extraneous stuff from various fields in the item entries for the books or other resources cited. Have no idea how this happened but presumably something in creating a PDF. We're going to comb out all this stuff but meanwhile two questions:

1. What happened?!
2. Is there some toggle or something to turn it off?

Thanks. (PS, I'm on an M1 MacBook using latest Word for Mac with Zotero plugin.)
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