Why parallel pool starts in MATLAB 2021b while running .slx file??

I have developed a simulink model in MATLAB 2021a and it works fine. When I try to exxecute the same model in another laptop having MATLAB 2021b, it starts parallel pool first and then runs the simulation. The problem is it does not provide the same result as I am getting in my PC having 2021a. Infact the results are totally wrong. I could not find out the reason. Kindly help to resolve the issue. Please the the attached screenshot. Thanks