Hello Mike,
Penmap saves the project in metres generally.
The display unit can be set in Application, the project remains in metre but the coordinates are shown as set.
If you need another export unit you can set this in the export dialog.
Looks like this in Penmap for Android/ in Penmap Project Manger. You can set the horizontal and the vertical unit independently.


I checked a tree in your dwg. Coordinates are X= 407457.5799 Y=152471.7052 Z=148.305. This looks like horizontal units in metres and vertical in feet.
If I export everything to usFeet I got X=1336800.4099 Y=500234.2527 Z=148.0305.
If I export everything to metre I got X=407457.5799 Y=152471.7052 Z= 45.1198.
Please set vertical and horizontal units as needed and export again.
Cheers
Conny