bmg_bob · Global Mapper Programmer
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When you export your GeoTIFF elevation grid, be sure to select the option to use 32-bit floating point samples. If you select either of the integer sample options, and use FEET for your vertical unit, the elevation values will be stored as integers in feet, and you will get the result you are seeing.
It looks like you are using Global Mapper 22.0.0. The parameters flagged as missing are new, and were added to the 22.0.1 release. Please download the latest release of Global Mapper to resolve this issue.