They're referring to the max altitude setting, which is supposed to limit how high the aircraft can fly. The RTH altitude only comes into play when RTH is triggered, making sure the aircraft climbs to the correct height before heading back...
I've had the similar issue with a night flight:
Air 3S RTH is set at 50m. Yet, aircraft would climbs to 500m if I did not stop it.
All firmware undated.
Here's what DJI responded:
Due to the ambient light being too strong or too weak, the...
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