Citation > 2 authors all mentions with "et al."

Hi everyone

I've got a problem with the citation of journals or books with more than two authors: the citation is already abbreviated in the first mention (for example "Hussy et al. (2013)" instead of "Hussy, Schreier, & Echterhoff (2013)"). But first, there should be mentioned all authors and in the second mention there should be only "et al.". I already updated Zotero, tried in a new document, started everthing from beginning, ...

Can someone tell me where the problem is?

Thank you, for your help!
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