This is a typical symptom when the power supply connector isn't locked.
Please be aware that Osmose’s power supply has a locking connector to prevent accidental disconnection. When inserting, first align the power connector’s wings to match the horizontal notches on the power input. Push firmly, then rotate the barrel clockwise to secure it to the casing.
It is expected that the power inlet has quite some mechanical leeway. The inlet component still has room to wiggle on the electronic board even when the power connector is locked, but the power feed will be stable.