Access Newbie Help

I am fairly new to Access, so please bear with my hopefully easy to answer questions. I am trying to create a database for a university where we input all of our student leaders information (name, email, student ID number, etc) along with the groups they are involved with so we can track and see who is involved with alot, and so we have easy access to their contact info if we need to do that. Anyway, I have already created a database to take in all the information and spit out the reports. It is probably pretty messily put together, but like i said, this is my first time working with Access on this scale.

My question is, when I created a report to display all the students involved with a specific activity, I ran into a bit of a problem. There are two students with the same last name, and for the activity in question, they both should be shown. However, it only shows one of their names (I have it set to show the last, first) but it shows both of their activity status. What am I missing to be able to split the names show its shows both names?

Here is a link to download the access file, and perhaps someone can tell me how to fix it.

http://us.f13.yahoofs.com/bc/440a2a54me2cd2c62/bc/access/Involvement+DB.mdb?bf8mTJFBardSN6ge

All of the sensitive information has been removed. It will still work without it though.

Thanks!