Hi Jojo,
Yes, my round donuts were diff to come out. Need to grease with butter/oil. Even after grease, some of the donuts still refused to come out... no choice...use tooth pick to force. The heart donuts was easy because of the shape.
Ya, I remember, the reason may be because of I reduced the amount of oil in the receipe. I normally try to reduce the oil and sugar, hope to bake some healthy food for the family. With that, my fruits will sometime not successful.