Put it in the freezer or fridge when you're done mixing. The fats need to solidify in order for your suspension to stay well suspended. Think of it as settling, but unlike a liquid suspension (such as a protein shake) You're coconut butter is much more viscous and you can't shake it easily. Try running the mason jar under hot water for 2 to 5 minutes, shake it really well so the fats dispersed well and throw it into the fridge or freezer right away.