Multiple Django Apps on single Apache2 server occasionally load incorrect URLS file

[dsteinkamp@…]

This is a rather odd bug we've come across in development, but here is the gist of it:

THE SETUP:
Two completely separate projects, Hostbase and Cellbill, are attempting to run simultaneously on a shared Apache2 server.

Hostbase and all its supporting files live in /var/www/webapps/ihw.
Cellbill and all its supporting files live in /var/www/webapps/cellbill

Each project has its own separate configuration file in /etc/apache2/webapps.d/ that defines locations and directories as per ​http://www.djangoproject.com/documentation/modpython/; each project resides at ​http://webserver/projectname/ where projectname is Hostbase or Cellbill. Here is the Config file for Cellbill; Hostbase is nearly identical (save things that shouldn't affect this):
Alias /cellbill/site_media /var/www/webapps/cellbill/site_media
<Directory /var/www/webapps/cellbill/site_media/>
Options FollowSymLinks
AllowOverride none
order allow,deny
allow from all
</Directory>

Alias /cellbill/django_media /var/www/webapps/cellbill/lib/django/contrib/admin/media
<Directory /var/www/webapps/cellbill/lib/django/contrib/admin/media/>
Options FollowSymLinks
AllowOverride none
order allow,deny
allow from all
</Directory>

Alias /cellbill /var/www/webapps/cellbill

<Location "/cellbill/">
order allow,deny
allow from all
SetHandler python-program
PythonDebug On
PythonPath "['/var/www/webapps/cellbill','/var/www/webapps/cellbill/lib'] + sys.path"
PythonHandler django.core.handlers.modpython
SetEnv DJANGO_SETTINGS_MODULE cellbill.settings
</Location>

#remove mod_python function from static media
<Location "/cellbill/site_media/">
SetHandler None
</Location>

<Location "/cellbill/django_media/">
SetHandler None
</Location>

THE PROBLEM:

The problem is that when someone goes to ​http://webserver/cellbill/, it will occasionally (typically not repeatedly, but sometimes) load the URL conf for Hostbase, and subsequently throw a 404 error (since none of my URLs match theirs) and vice versa with their project and my URL conf.

Anyone have any idea what might be going on? We are the only two people running Django projects currently, however more are likely to come to this server in the future. Naturally we would like to figure out what is going on before more projects are deployed.

Thanks!