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Continuously to Understand ramp color interpolation using QGIS 2.12, I used IDW interpolation on those height point without inserting the real values (minimum value is 8 meters, maximum value is 584 meters), and got the default ramp values:

enter image description here

But when I change manually the min\max values to the real ones, I get different interpolation:

enter image description here

I try to understand why the values and the symbology changed?

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The values for the raster result that was generated by the interpolation isn't actually changing--just the way it is being symbolized.

When you manually changed the min/max, your classification value levels, which determine how the raster is symbolized, also changed. The actual raster values, which is your interpolation result, aren't actually being changed.

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