It describes the fresh-food freezing task specified for the appliance, not the total weight of already frozen food it can store. Check the rating and required preparation for your model.
What the observation tells you
A cabinet can have empty space yet be asked to freeze too much fresh food at once. That load adds heat and can affect surrounding frozen items. Storage volume and freezing capacity answer different questions.
A useful next step
Plan fresh batches within the documented limit and use any prescribed mode correctly. Do not treat spare drawer space as permission to exceed the stated freezing load.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.