Door contents add moving weight, and the appliance must stand and be secured as the manufacturer requires. A tall cabinet should not rock during ordinary access.
What the observation tells you
Opening doors with heavy bottles can expose an unstable installation. Improvised wedges or lifting by a handle can create additional hazards. Integrated and freestanding models have different securing arrangements, so their procedures should not be interchanged.
A useful next step
Keep loads within the permitted fittings and stop stressing an unstable unit. Arrange competent positioning assessment and explain the door-loading pattern rather than treating movement as a cosmetic nuisance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.