Module Uninstalled and Flushed from DB, Still Appears on Modules List

Repeatable: Consistent

Steps to repeat:

1. Load /admin/modules.

Expected Results:
XML Sitemaps module has been uninstalled and all components have been fully deleted from its file path. It is expected that the module will no longer appear in /admin/modules as a disabled module.

Actual Results:
All components of the module remain displayed in /admin/modules.

Steps Taken:

1. Full search of server files. Found no component files remaining.
2. Deleted all module-related tables from the database.
3. Flushed cache.

Result:
On flushing the cache and searching the database again, I find that all deleted tables have been rebuilt.

Additional Information:
OS: CentOS 6
Database: MySQL 5.6.29
Web Server: Apache 2.4.23
PHP 5.6.25
Drupal 7.50

No relevant errors in site logs.