That's because OZ converts the heightmap to a ground mesh based on your N/S and E/W sizes, but it makes the zone a grid where each section is 64x64 units across. That's so you can edit the ground mesh's height or paint textures onto it with the ground editor. If your zone is too small to support this then OZ figures out the height where it needs to create grid nodes. It's basically just how OZ is designed. You can always make it smoother by making the zone bigger. For example, if your heightmap is 32x32 pixels then that means that the zone will have 31x31 grid squares (the units in the bitmap represent the elevation at the corners of each grid square). In that case making the zone at least 1984 (1984=31x64) units in both the N/S and E/W directions should exactly reproduce your heightmap.
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