Well, I don't know exactly what is causing this, but I finally figured a solution.
In the form tag, I put onsubmit="return false;". Now it doesn't default submit and will still AJaX submit.
If anyone knows of a website that can offer ColdFusion help that isn't controlled by neurotic, pedantic jerks* (stackoverflow.com), please PM me with a link.
* The neurotic, pedantic jerks are not the owners; just the people who are in control of the "popularity contest".