GPS Data Logger Software - BT747

I'm comparing gpx files generated by BT747 1.68.30 and latest Holux Logger Utility and I see significant difference in numbers.  Both cases use the same log from Holux M-241,  one downloaded using the Holux Utility and converted using the same utility; and for the other -- log was downloaded using BT747 and converted using BT747.  The BT747 does not have "imperial unit" check set, so both programs should be logging in metric.