568913 Magento - Order Success Page showing wrong template

I use onepage checkout in Magento. Recently, our onepage checkout order success page is showing the wrong template. I cannot figure out what to change to make that page show the correct template. The entire Magento site uses the custom theme located at /app/design/frontend/default/shop/template/ and /skin/frontend/default/shop/ The one page checkout success page is pointing to the following theme: /app/design/frontend/base/default/template and /skin/frontend/base/default/ We need the one page checkout success page to use the same theme as the entire Magento site. Can you please check to see if there is a file that is directing our onepage checkout success page to use the base/default template? I moved over our CSS file to the base/default template...but that did not fix it. It only changed the look a bit. I have searched for literally DAYS on this issue and tried to fix it, but I can't figure it out. I have a test site at XXXXXXXXX and it shows the correct checkout success page. So I am not sure what is causing this. I have uninstalled any recent extensions, but that has not seemed to have helped any.