Screen Brightness working strangely on MacBook Pro running 10.8.5

When I try to reduce the brightness of my screen, it goes black on the 5th of about 12 levels, and it won't come back from black until I hit the last (highest) brightness setting.  What's up with that?

When I try to reduce the brightness of my screen, it goes black on the 5th of about 12 levels, and it won't come back from black until I hit the last (highest) brightness setting.  What's up with that?

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