Made oven ghee - what is the liquid at the top of my cold ghee? Yesterday I made ghee in the oven by cooking sweet butter for 2hrs in the oven at low temp.  I filtered the resulting liquid through cheese cloth and let the resulting clear liquid sit overnight.

Today, the ghee has congealed into a solid, as it should.  However, on top of it is an oily liquid.  I poured some into a glass and added water, and the two liquids don't mix, so it's not water left over from the butter (good news).  Still, I'm confused why I don't end up with a uniform material.
Some butter is mixed with sunflower oil in order to make it more spreadable. Have you checked the ingredients list (if there is one) on the butter?