Hello, I'm new to the raw goat milk world. I've noticed that there is always stuff stuck to the bottom of the jar. Is this normal? Everything I read made it seem like it's not. I thought maybe it was just getting old, but I just noticed it with milk that was only 1-2 days old. When I mentioned it to the farmer she just said she makes sure to give it a good shake before pouring. Since cream goes to the top I'm wondering what it is and if it's considered safe.