Well, I've been trying unseccesfully since 2017 to bring this to attention but here's me trying again I guess.
Sybaris Prime horns have been misbehaving since release. The intention is the horns has 2 positions:
A downed one, for holstered position:
And an up/in use one, for when you have it in your hands:
Then, when you fire the weapon, there's an animation that lifts the horns and should return them to this normal position. However, what happens both in game after