This article contains information about Oscommerce.
My oscommerce categories are showing categories from another website how do i turn this off?
The cache control allows the store owner to save certain areas of the
shopping cart to a cache folder typically called oscommerce_data. This
allows for a performance increase when users are browsing the store as
the database is not queried again until the cache has expired or has
been reset by the store owner. The directory for holding cache pages is
setup during the setup procedure and the folder is called
oscommerce_data during the install but it can be renamed.
Solution
Figure 1 shows the
Cache listing page under the Admin>Tools>Cache section.

Figure 1. Cachelisting page under the Admin>Tools>Cache section.
To edit the details or move a folder click on one
of the editing tools under the "Action" column next to the "Title"
being edited. To remove click the blue trashcan.
When the oscommerce_data (cache) folder is setup, an accessed product
page will be held in this folder for quicker loading the next time it
is accessed.
Note: It is recommended that the cache
directory is NOT in the same place for all stores hosted on the same
server for security reasons.
Blocks of cached pages from different store areas are shown in the
admin under Tools/Cache Control. The cached pages can be deleted by
clicking the delete button which will remove the cached page from the
oscommerce_data (cache) directory. These pages will be replaced
automatically when accessed again.