API feed Year error

Has anyone else had issues with filters on an API fed page not working correctly?
This group library - https://www.zotero.org/groups/6151707/obsic_ocean_bottom_seismic_instrument_center/library - feeds this publications page - https://obsic.whoi.edu/publications/ - and when the "Year" drop down is used to filter results, publications from other years are coming up as well (see attached screenshot). Is my metadata not formatted correctly or is the 'Year' dropdown pulling from the wrong field or something? Please help - thank you!
https://s3.amazonaws.com/zotero.org/images/forums/u9618988/obilc6l3dec2dxyx4srw.png
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