Zotero bibliographies are not guaranteed to be 100% perfect.

If you notice an error in the bibliography, you cannot simply directly edit the text of the bibliography. Your Zotero plugin is frequently checking back with your Zotero library, and will erase any changes you make to the bibliography within Word.

In this example below, in APA format, the title of this article should be in sentence case. You'll notice it's in title case instead.

A bibliography, with a red line highlighting an article title in title case.

To fix this, open up your Zotero program and find this item in your Zotero library.

Click on the title field on the right-hand column, and change it so that the title is in sentence case.

To save your changes, just click anywhere else in the program.

The Zotero program, displaying editing a field in an entry.

Next, go back to Microsoft Word, click the Zotero tab, and select 'Refresh' from your list of options.

If you check your bibliography now, you should find that this error has been fixed.

A bibliography, with a purple line highlighting an article title in sentence case.