Global Mapper Pro

strange results when loading .bil elevation files in GM18

I am loading .bil elevation raster files into GM18. The files were created by rasterizing XYZ data in GM18. Now, when I load the files into GM18, they usually are interpreted correctly. However, some files are read incorrectly and have their elevations multiplied by a factor of approx. 1.7 to 2.3 Million! I can still see that it is the correct portion of the DTM, but the values are way off. When I load the same files into GM10, they are always read correctly.
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