Why does Aladdin‘s Biochemicals sometimes ship chemicals at room temperature when the vial is labelled 'store at +4°C or -20°C'?

Why does Aladdin’s  Biochemicals sometimes ship chemicals at room temperature when the vial is labelled 'store at +4°C or -20°C'?

Storage in the refrigerator or freezer is often recommended for long-term stability of a product. If the product is shipped at ambient temperature it is considered to be stable for the duration of shipping and normal handling. Upon receipt you should then store it in the refrigerator or freezer (as indicated on the label). If you have any specific shipping requirements, please contact customer service.