Stop trying to predict categories as the algorithm can't properly do it.
Shadowfire Lives commented
Or at least try to tweak the algorithm. I posted a question about gun control, and it got put in the financial section.
Henry Boyter commented
It is probably correct more than 75% of the time. Much more if the poster uses some guiding keywords. And if they took it away, what would happen? The questions would go into a queue until the user picked the category 100% of the time. Wait, you can do that now. The queue is just the algorithm picked category. Then users would complain about having to pick the category 100% of the time. Your best bet is to write questions with more keywords, but not conflicting keywords.