How do I get rid of the "b" on the end of this citation?

schlegelamy · December 1, 2017

So I input this internal citation into Word and even though in the reference folder Hatzenbuehler is only mentioned once, so I am not sure why the "b" is necessary. Could you help me solve this problem?

Example: Hatzenbuehler & McLaughlin, 2014b

dstillman · December 1, 2017

Almost certainly just this: https://www.zotero.org/support/kb/given_name_disambiguation