Collecting the admin-media files from different django application is one of the not-so-good things about django. Usually you have to file copying from the module distributions to your directory every time one you install/update/remove a module.
When you are using several django application that do have their own media/admin files, some of them even overriding others you need a proper way of collecting them and building a correct media directory.
A proper solution should be able to recreate the directory by collecting the required files from the modules in a specific order, allowing them to override each other.
Useful links
What solution do you have for this issue?