Hi,
I am not completely sure why your url never changes... I would think this make for a very small site =-)
But this page can help you. You can tag your post command on you "last step" submit, like order confirmation or something.
Google Analytics Help Center
I also think it's rather strange that Google is pulling the conversions and no financials. You might have to look at the parameters in the integration section and code them properly for your cart's macros.
Good Luck,
Melanie