I suggest checking 2 things. First, when you turn the tank on and then plug the GFS receiver (aka "apple") in, it will run like that. Make sure the apple is plugged in, then turn on the tank.

Second, you might have it in 'test' mode. Check the dip switches on your MF unit and verify they are set correctly (dip switch settings will be covered in the little DMD manual that came with the tank).