Not all references in Zotero are in Overleaf

Hi everyone,

I am using Zotero in Overleaf. I introduce a reference as follows:

1. Using the Google Chrome extension, I click on add to Zotero when I find a relevant paper (when I am on the publisher site), with Zotero app opened.

2. I go to overleaf and refresh the linked bibliography. I observe that the new paper is added.

3. Add the reference on my text.

It worked very well in the beginning, but from one point on, when I added a reference I observed that the number of references in my bibliography was the same, meaning that another one was removed (only happens sometimes). Right now I have 57 papers on the Zotero bibliography (on the app), but only 33 on Overleaf.

What could be the reason?
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