APA 6 style not reducing multiple authors to et al
Citations with 3 & 4 multiple authors should all be presented the first time, and thereafter rendered as: First_author, et al - it's happening sometimes, but further into the document all authors are listed again. I'm using Word 365. One solution is to change 'store citations' from Fields to Bookmarks (or vice versa) - which seems a bit odd so I though I'd raise the issue.
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Upgrade Storage
1. You have automatic updating of citations turned off (citations would be underlined with a dash line in that case)
2. You have duplicates of that item and are citing both (you would be able to tell by the bibliography; there'd also most likely be an a/b suffix behind the year
3. You have other items with similar author lists: Zotero follows APA's rule to list additional authors to distinguish between different lists of authors with the first 1, 2, etc. authors.