After filling in estimated shipping, user sent to guest checkout page (with errors)
 

Hi,
Just wondering if anyone is having a similar problem.

If I'm on the cart page, and I fill in the estimated shipping fields, then click "checkout," I'm sent to the guest checkout page.
cart.php?mode=checkout&edit_profile&paymentid=0

There, all the fields are marked red, and I get an error message at the top that all of the fields were not properly filled out.

There is no way for me to return to the normal first checkout page where I'm prompted either to login, or checkout as guest.

Is there a way for the checkout to default to the initial checkout page?

Thanks,
Jenny