Food needs safe cooling and storage before and during freezing, so available litres alone are not enough. The freezer also has a stated fresh-food loading limit.
What the observation tells you
A large batch can overwhelm the refrigerator during cooling and then demand too much from the freezer at once. Dividing it into suitable portions helps handling, but it does not cancel the appliance limits or food-hygiene timetable.
A useful next step
Plan container sizes, cooling and storage before cooking. Follow official guidance and the model's freezing instructions. Use additional suitable storage if the batch exceeds what the appliance can manage.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.