Has anyone notice differences in the quality of sunflower hearts. I usually buy 12 kg bags from Costco when they are in stock. They are usually around £10 a bag when on special. I ran out and bought a 12 kg bag from Home Bargain which were a little more expensive but far cheaper than many outlets. However I found that they stick to the side of the seed feeders. A closer look revealed that they are not all full seeds. Lots of seed fragments mixed in.