Made my first batch today. Olive oil/Coconut Oil. Did the calculations, followed a recipe, everything went smooth. Trace came slower than I thought but did eventually come. mixed in a few oats, honey, Lavender and Tea Tree EO. Poured into the mold and it looked very smooth and even. Covered with towels...when I checked on it about 30 minutes later I see this. The center had sunk (or maybe the edges rose or both). Any ideas what might have gone wrong?