Mpc timestretch

hi I’m struggling with timestretching on my mpc one I am currently trying to remake touch the sky by Kanye west which is 99bpm and samples Curtis mayfields move on up which is 139bpm. so I record move on up and then edit it when I go to timestretch in process I put in the correct bpm for both and then press do it but it is never on beat like in serato sample does anyone know why and also do I need to change ratio and beat?