different citekeys between my different machines

I have zotero on both my PC and laptop. They are properly synced, and the citation key for both is set to be [auth][year].
However, the letter postfix in the case of multiple papers of the same author-year is not the same between the two Zotero libraries:
the PC Zotero has:
paper 1: Roudi2009*
paper 2: Roudi2009a*
paper 3: Roudi2009c*

and the laptop Zotero has:
paper 1: Roudi2009b*
paper 2: Roudi2009
paper 3: Roudi2009a*

I even set the "keep keys unique" to 'across all libraries', but it didn't help.
any solutions?
Thank you
  • edited June 4, 2019
    Until Zotero gets a native field for citation keys, the only way to get citekeys reliably synced is to pin them.
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