LDAP query returning incorrect info.

Hello,

I have a question about using LDAP and the REMOTE_USER commands.  Here's a little background.  I'm developing a company intranet that uses these functions to determine user name and department.  Then it displays content tailored to that user/ department.

In my application file I have:

<!--- User Logged In --->
<cfset application.username = Mid(REMOTE_USER, 15, 20)>

<!--- Set Department --->
<cfinvoke component="#application.components#AD" method="get_logged_in" returnvariable="get_logged_in">
<cfquery name="my_dept" datasource="#application.dsn#">
   SELECT dept_name
   FROM departments
   WHERE ad_name = '#get_logged_in.department#'
</cfquery>
<cfset application.dept = #my_dept.dept_name#>

The username pulled from the REMOTE_USER function is used in the get_logged_in function, which is the ldap query.  From that it pulls the department and the my_dept query maps that to a custom department table.

All this works fine, except...

Sometimes a user will be on the site, and it will be displaying the wrong user name, and hence, the wrong department.  It is usually fixed by refreshing, which then usually gets the correct info.  I'm not quite sure how to stop this from happening in the first place.

Any help appreciated!!