Reference is deleted from text, but not from bibliography when bibliography is added

I am working on a paper. It has about 40 citations, entered via Zotero. I put in the bibliography. After that, I had to delete a couple of citations. So I deleted the bibliography, then inserted the bibliography again via Zotero. But the citations that I had deleted from the text were still in the new bibliography. Does anyone know what is causing this and how to prevent it?

Thanks.
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