Manufacturer instructions may require specific preparation before first use. Transport restraints are part of that process and should be dealt with by the competent installer according to the exact model.
Understanding this situation
A machine that moves violently after installation should not be run repeatedly in the hope that it settles. Delivery, positioning and connection details are relevant, but they do not prove a single cause from a distance.
A useful next step
Stop use and contact the installer or appropriate service provider with the model and installation history. Do not randomly remove rear bolts or internal parts based on another machine's video. The correct preparation needs to be confirmed before ordinary operation.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.