Should that look like the following (see private below)?
I've also listed the debug page which I assume changes depending on what's in session at any one time?
Also, this wouldn't be causing a problem would it:
3. Ensure you post your rate request to the UPS Rating API production URL to see the actual negotiated rate. The XML production URL is https://onlinetools.ups.com/ups.app/xml/Rate
What URL is eCart posting the request to?