The op's probably already got this figured out, but for future lookers.
Those switches are DPDT (double pole, double throw) return to center switches. In order to reverse polarity they need to be wired a certain way.
I've attached how the switch is wired on the back. Use this and Iggy's diagram and you should be able to wire it correctly.
If you find that up is down and down is up, just reverse the positive and negative on the back of the switch.