postback causes animated transition

postback causes animated transition

simple example:

on my login page, user enters login/password then hits submit button.  Submit button posts to server, validates request.  If authenticated, user is taken to main menu else login page is shown again.

In alpha 1, if login failed, postback would return login page with no transition as you might expect it to work.

in alpha 2, if login failed, jquery mobile transitions the same login screen from right to left which is not what you would expect to happen.

Can anyone explain if this is a bug or do i need to change how i post back to the server to just show the same page again?  The exact same page works fine in alpha 1, but alpha2 now shows this transition.

I'm using asp.net mvc2 if that matters..

Thanks in advance.
John