"Courses taught by this instructor" lists more instructors than necessary

[jthurst3]

It seems like when you click on an instructor's name and select "courses taught by this instructor", you get every course taught by instructors with the same last name. Steps to reproduce:

1. Go to skedgeur.com and type "CSC 173" in the search box
2. Click on "Brown C" and click on "Courses taught by this instructor"

Actual output: http://skedgeur.com/?q=instructor%3Abrown

Expected output: only courses taught by CB