Uninstalled, but two tables keep re-Creating themselves

After playing with the module on my sandbox system, (running Drupal 5.0), I first disabled, then uninstalled, then deleted decisions from my modules folder. However, when I disable any other module, I get the regular message of "The configuration options have been saved." followed by:

"The content fields table node_decisions_ranking has been created."
-and-
"The content fields table node_decisions_selection has been created."

If I then go into my database and directly delete these tables, and repeat the above process, I get the messages again and the tables are once again created. Is this a bug with the decisions module (i.e. it didn't uninstall everything it should have), and if not, why is this happening?

If you need more info on my setup, let me know.