I am unsure exactly how you have your setup, but I assume your scaling your character over time and using a blueprint derived from the “character” class. Your issue is that the root component is the middle of the capsule collider, so when you are scaling it the height of the capsule is being scaled around the center point.
You will likely want to linetrace towards the ground below the character and set the characters position to the impact point + (the capsule half height * the actor scale).If you can provide more of your setup I can help with a more specific answer.