Multiple items in same year by same author not listed correctly

Dear Leanne

Thank you so much for your reply. I double checked and I do have x 7.5 up and running. 

I did try your advice, but with not much sucess. At the end, I just gave up and coverted my thesis to Plain Text and maunually fixed it. At least by that way, I can fix my citation.

I really appreicate your feedback though. Thank you again for your help. :o)