The cable is too tight. Hand embroidery will wrinkle if the embroidered mother pulls the thread too tightly, so don't be so nervous when embroidering. Try to keep the strength of the stay wire unchanged, or the winding quality is not good, or the fabric is not stretched well, or the cotton is not filled enough. When embroidering, it will be soft if it is sun-hardened first, and then it will be sewn once through the cloth (preferably open) with needle and thread, and then it will be wrinkled into a ball next year.