Zotero not inputting publication dates of ProQuest documents

Each book in ProQuest's 'Early English Books Collection' has a clearly displayed date of publication (e.g. Thomas Hobbes, Leviathan, London, >1651<), but when extracting and inputting the dates of some books into my Zotero Library, Zotero will for some reason enter the place of publication (London) in the field for the date (1651). The actual metadata in the date field will read "p. London." For other books, instead of the date it will read "leaf of plates" or "leaves of plates" or "p., [1] leaf of plates" - very weird.

Solutions anyone?
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