APA 6th should always only ever be author last name and date of publication (plus pagination if a direct quote). Never add initials!
Yes, I will up-vote a similar concern about the Harvard style having the same problem (it appears) but this is crucial for users of the APA style. The a, b, c method is fine for same author, same year, different publication, but how on God's green earth did you come up with adding author initials to make distinctions? Please get it right. We have an institutional account with you and students use writ'n'cite to enter APA correctly.
Author initials were added at customers’ request, to distinguish between authors with identical last names. However we realize some users require the original style. We are looking at how best to address this and have both options available, and should have an update here soon.