Global Mapper v25.0

Pix4d classification loads as 'Unclassified'

imagecatcher Global Mapper User
I must be missing something when it comes to editing the PIX4d point cloud. I classify the usual handful and importantly move anything I don't want into 'Disabled'.
But when I export these out and import/load into GM they all group together in 'Unclassified'. 
Does Pix & GM use different protocols for Lidar classes?