Breastmilk popsicles powdery?

Madison

Hey all! I decided to try the Breastmilk popsicles for my LO when she’s teething and needs some soothing. I noticed that the milk has turned to powder at the bottom of the popsicle where it attaches to the handle, and is covered in a layer of the powder. She eats them fine and it shouldn’t be bad. It is definitely not freezer burn. It looks just like formula almost! Any suggestions what this is??