same author, same year: a, b, c - problem...

what can I do possibly wrong if, all of a sudden, zotero does not do the "smith 1980a, 1980b, ect.." differentiation in the footnotes? It did it this morning, and suddenly, this afternoon, changed everything back to only "smith 1980".
what's going on? I did not intervene in the meantime!

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