After you drop/launch one or both of missiles this heli, eventually, will become heavier oO, and require much more lift force to hover.
Possible reasons:
1. side decouplers are attached upside down
2. there was several times bug when after firing missiles all control surfaces that belongs to main command pod was deactivated, but I cannot reproduce it anymore.

Video report

Bug Planned Found in 0.6.7.2
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