Author surname initial in citation

I have the problem, that in some citations within the text in word the inital of the authors surname appears although the 2 entries in the bibliography have the exact same first author name. E.g. "Wheelwright S et al. (2013a)" und "Wheelwright S et al. (2013b)". How can I change the automatically filled in citation without manually altering it in the text every time?
In Zotero itself appears "Wheelwright et al." in the column "Ersteller".
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