I know just how to fix it, if anyone needs to know.
EDIT: If the bots aren't moving, it's because someone spawned them in wrong. They must have simply typed tf_bot_add <value>. However, if it's a new or unlisted map, you must first type nav_generate, then let it work. It'll may take some time, however time taken varies between maps. After it's finished, the server will reload, then you can add your bots.