Chicago (author date) inconsistent in using initials.

Hi - I've been using Zotero for years, but not come across this before. I'm using the most recent version of Chicago and getting inconsistent use of initials in the inline citation:
(e.g., Bligh 1972; L. B. Clark 2018).
I've checked, and both have first and last names correctly entered in the library.
Any thoughts?
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