This is precisely what is occurring. The battery with the highest charge level is first topped up, followed by the other two in turn, prioritized by the charge level detected in each one, until all three are fully charged in sequence.
One thing it could be. The DJI charger charges one battery at a time, starting with the battery with the highest remaining charge. That enables the quickest time to get a battery fully charged and the drone back in the air.
Ignorance is bliss. Open your eyes! The evidence is all around you, but if you choose to ignore it, you do so at your own peril. I have no need to convince you. He who is convinced against his will is of the same opinion still. LOL!
Most people who have used both Litchi and DJI Fly waypoint missions know that the flight paths differ. If the same set of waypoints are used in both applications, in DJI Fly, the flight path goes through the waypoints while in Litchi, they do...