orgId Parameter in Login URL

I am testing an installation of JRS 5.5, and am using the orgId parameter to specify Organization in the login URL.

 

ie:

 

 

Upon page load, this seems to work for a moment, in that only the User ID and Password fields are displayed on the login page.

 

However, after about 4 seconds, the Organzation field appears, thus prompting the user for an Organzation, User ID, and Password, even though the orgId has been specified in the URL.

 

Any idea why this might be happening?

 

 

 

Thanks.