General topics were imported without any tag. But like all topics, they will appear wherever the users tag them.
Want to help make things nice and easy to find? Go through your topics (and of others if you have time) and tag them. Try to use a few tags that make sense and in time finding topics will make more and more sense. This is a system that depends on multiple tags by multiple people. We imported a simple 1 to 1 match on forum name and left general blank.
All of it will only start to work well when a lot of users have used it.