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@jersey
Like all frames, MTB frames are designed to have a certain headangle i.e 67 degrees. The geometry of MTB frames are designed to accept **relatively long **suspension forks and have the right headtube angle. As such, when you're running a rigid fork on a bike that is designed for **relatively long **suspension forks you have to suspension correct the rigid fork. This basically means making it longer than it needs to be so it raises the front end to the point that a suspension fork normally would. if you didn't the front end would be too low and too steep.
here is a dramatic example of a suspension corrected fork. It's fairly easy to imagine that with out the fork being that long, the headtube would be near vertical.