After passing through the steps parent.position.y gradually increases from 0 after returning to the ground position.y is not processed to 0

In the third person, models collide with models with height and then add a certain amount of height to not fall down

After passing through the steps
parent.position.y gradually increases from 0 after returning to the ground position.y is not processed to 0

Do you mind pointing where the code in question is
Also what should we see in that PG? I see a standing character. What is wrong?