Count Online Users Conundrum

[Sung Woo]

I got this little snippet from easycfm.com to keep track of online users, but lately, it hasn't been working quite right.  What happens is that at the end of the day (I run an intranet where there are about 200 peak users), around midnight, it still shows 80 or so users online!  What do you think could be causing this?

<!--- http://tutorial12.easycfm.com/ - show session users - BEGIN --->

<cflock timeout="15" scope="APPLICATION" type="EXCLUSIVE">
    <cfif NOT isDefined("Application.UsersInfo")>
          <cfset Application.UsersInfo = StructNew()>
    </cfif>
</cflock>

<cflock name="#CreateUUID()#" timeout="15" type="EXCLUSIVE">
      <cfset user_cfid = Evaluate(CFID)>
      <cfset user_time = Now()>
</cflock>

<cflock scope="APPLICATION" type="EXCLUSIVE" timeout="15">
<cfif NOT StructKeyExists(Application.UsersInfo, user_cfid)>
  <cfset temp = StructInsert(Application.UsersInfo, user_cfid, user_time)>
</cfif>
</cflock>

<cflock scope="APPLICATION" type="EXCLUSIVE" timeout="15">
<cfloop collection="#Application.UsersInfo#" item="itmUser">
  <cfif
   Evaluate(DateDiff("n", StructFind(Application.UsersInfo, itmUser), Now())) GT 15
  >
    <cfset StructDelete(Application.UsersInfo, itmUser)>
  </cfif>
</cfloop>
</cflock>

<!--- http://tutorial12.easycfm.com/ - show session users - END --->

-----

<!--- http://tutorial12.easycfm.com/ - show session users --->

<cflock scope="APPLICATION" type="EXCLUSIVE" timeout="10">
    <cfoutput>
         Total Active Sessions : #StructCount(Application.UsersInfo)#
    </cfoutput>
</cflock>

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