Silly questions about reports and comboboxes

Hi all. I know I'll feel really silly when the answer is posted but...

I have a report. I tried it two different ways.
1. Based on a query of given tables
2. Based on the tables themselves. (not too much data, no need for anything
elaborate)

Here's my problem: My tables look up information in a third table to create
a dropdown menu. When I run my report, it is showing EVERY item that is
available in the dropdown (complete with the scrollbar!!!)
How do I make it put in the selection. It's currently highlighted in the
dropdown as displayed on the report, but this is one ugly report!