Mapped Network Drive points to wrong location

I have a user that is ecperiecing this problem sporadically. Whenever the user logs on, two networked drives should be mapped auomatically. One of them points to a share drive that everyone has access to and is mapped via a logon script. The other drive is the user’s personal mapped drive that is assigned in the user’s profile in Active Directory. Every now and then both drives will map to the general share that is mapped from the logon script. Does anyone know what may be causing this? The user uses Windows XP and the server in question is running Windows Server 2003.