Different foods do not have identical texture at the same temperature. Hardness alone is therefore a poor way to compare the freezer's performance.
What the observation tells you
Sugar, fat and other ingredients affect how a product feels, while the package size affects its response to warming. A soft dessert and a hard bag of vegetables may have shared the same conditions. Neither observation reconstructs a previous thawing event.
A useful next step
Follow the product's storage instructions and use suitable temperature information. Report unusual changes in a particular product alongside other evidence, rather than treating a comparison between unrelated foods as a precise test.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.