He is using FASST, Failsafe and Hold settings are done in the F/S, Hold Menu in the TX.

i think your problem is that the receiver was binded with the gear switch in the up position, Rebind your receiver with the gear switch down.
basically your failsafe is set for gear up and when you switch the system on it momentarily goes into failsafe and that will make the gear go up. i hope this helps, this is what i did when my gear was doing the same.
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