I had duplicate references in my document, because I merged multiple documents and the references weren’t up to date everywhere. I brought all references up to date and then via the “Find duplicates” removed one. This worked in 90% of the cases.
However, in one case I still get author et al. (2012b) even though there is no other reference by that author in my database. I have another one from 2015 by the same first author, but it is a sole authored work and it is displayed correctly.
How can I convince endnote that the b is unnecessary?
I have tried various things I read online like exporting it to a traveling library, changing style, but nothing works so far.