in-text citation format errors

Hi there.

Can anyone tell me how to fix the in-text citation format … EndNote is including first name initials as part of some citations - e.g. instead of (Skinner, 2010) it is giving me (N. Skinner, 2010). This is only occurring for some citations, and I have tried deleting the entire reference and re-entering it, but this has not fixed the problem. I am using APA 6th for referencing.

I am starting to panic as my thesis is due next month!

Thank you in advance 

Duplicate posting. Refer to active thread and discussion here.

My apologies for the duplicate posting.