I'm just beginning to use EOs rather than FOs and ran into a problem on my first batch. I mixed together Crafter's Choice Sweet Orange EO (1.2 oz) with Sun Pure Botanicals Patchouli EO (.35 oz). Stirred them together, seemed okay. But when I went to add them to my batter at trace, it had separated into oil with a tarry glop at the bottom. I went ahead and poured the liquid oil into my batch and this photo is what I had left. It took a brillo pad to clean the tarry mess out of my mixing cup. Any ideas what happened?