Duplicate citations in endnotes

Hello
I'm finding that many of my endnotes contain duplicate citations, for example

“Jamaica’s Gully Queens,” accessed January 10, 2021, https://www.vice.com/en/article/kwpn4n/young-and-gay-jamaicas-gully-queens-288. “Jamaica’s Gully Queens.” “Jamaica’s Gully Queens.” “Jamaica’s Gully Queens.”

I'm using a 2014-era Macbook pro running High Sierra, Word for Mac 2011, Zotero 5.0.96.1

This is for a book manuscript so there are a lot of notes, it's difficult to keep checking them and if I delete the duplicate it seems to think I have altered a field.
How can I stop this from happening?
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