Part Cooling fan speed reversed

When I set my part fan to 0%, it spins at 100%, if I set it to 100%, it stops. If I set it to 75%, it spins at 25%.
Any idea what the issue is?
Solution
Add a "!" in front of the pin of the fan port... Like this:
[fan]
pin: !PB11
or remove it if there is one.
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