Hi, Aaron. I can replicate the problem you’re having in both EE 2.1.3 and 2.1.4 Beta. The expected behavior is to return to the page you started from, but it doesn’t - instead it goes to the template.
I filed a bug report on your behalf.
I don’t know if you’d consider using this, but you might see if Solspace’s Freeform module will work for you. I often use it instead of the built in contact form.
Here’s a link from their docs:
http://www.solspace.com/software/detail/freeform#return
I haven’t tested with it yet…