Why the area is wrong in OptiSurface? OSD file says that the acreage is 55.03 ha but in reality, it's 5.1 ha.
Either of the two below has been selected:
You must have accidentally selected feet as the units when you imported.
Solution: Import the survey again but select meters as the units.
Or, it must have surveyed in feet and you have imported as meters.
Solution: Check the survey file.