Issue Pointing AR Web Server to Specific AR App server

We have multiple AR web servers..  On each web server there is a config file that list which AR app server that particular web server connects to:

c:\Program Files\One Identity\Active Roles\8.1\Web\Public\xml

Typically we can change the AR app server name in that config file, restart IIS and then when users log into that AR web site, you can see its connected to the AR app server that we defined in XML file.

Our issue is we have one particular web server, that no matter what server name we put in that config file, it always connects to back to the same AR app server.  Is there some other setting that could be taking precedence over the value in that XML file?  

Its just this one particular web server having this issue, our other two, we can change the value in that XML file, restart IIS, and then that web server will use whatever server is defined in the XML file. 

Thank you.