It’s normally down to the supply chain storage rather than the way the product it made. After a shortage (like during the lockdown) most suppliers bulk out when then can and secure discounts, this results is stock being stored in warehouses with temps going up and down before it even makes its way to the stores. Go to a big B&q and they will have 20 pallets in the racking, small store might have 1 or 2. (Both will have a pallet of make good waiting for disposal)