can't do motion maching with slow animation

Hello,
Today I started to learn motion maching with the “Game Animation Sample” but there’s something I can’t understand, it’s that when I slow down the play rate of an animation like the run, it starts to loop but with a huge blend mode between which gives the impression that the animation will stop.
I’ve tried changing the continuing pose cost bias and the looping cost bias but nothing changes.

Does anyone have a solution?