If the cups with hearts glazed onto the bottoms are yours, please come wet sponge them off if the piece is flat on the bottom. Some went through this load and stuck- more are on the shelf waiting to fire.
The pink you used is apparently not underglaze.
You used either glaze or stroke and coat which should not be used on the bottoms and are therefore sticking to the kiln shelves during firing. .
Also the pretty floral vase had a broken petal laying by it on the “waiting to be fired glazed shelf”. I fired the little petal piece it on a stilt And placed it in the vase after firing. I’m not sure why the petal was broken- I had noticed it earlier there on the shelf when it was not broken.
