Simplefoc angle model back EMF

Hello, I am using SimpleFOC in position control mode. In actual use, there is an issue with back EMF. When the motor rotates clockwise and an additional clockwise force is applied to it, the motor’s working power gradually decreases, and the rotational speed increases without any holding force. Additionally, due to the back EMF problem, the power supply voltage can be elevated in reverse. How can this issue be resolved? What changes need to be made to the code? Which parameters need to be adjusted?