Patent: 'Issue Date' input changes to incorrect date after pressing Enter

filled in relevant information for Patent hosted on Google. Issue date of '1966-02-22' keeps changing to '2017-11-8' by itself. unusual. v6.0.27 windows 10 pro.
duplicated item to isolate issue: date changes once URL field is copy/pasted from Zotero plugin grab Google Chrome:

disabled Zotero Date from Last Modified add-on, v0.1.0

issue resolved
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