Leanne,
Thank you for the response. I do have two authors with the name Burke however, they are different years. One is Burke (2001) and the other is Burke (2016). I believe the only time you should use the initial is when the authors have the same name and same year.
Bigger issue is that EndNote is not consistently doing this. A majority of the citiations are correct where I have duplicates. It is just a few authors where this is occurring.
Respectfully,
Shaun