help needed with issue using retarget animations

i’m having a little problem with some animations, i bought a character and an animset from the market place.

the character comes with a simple blend space with idle, walk a runing.

i’m trying to add the animation from the animset (from kubold) that i have bought to the character but i’m facing a little issue, when i retarget the blend space and the animations, the character goes a little bit under the floor.

here are two picture of the problem, the one is the character with it’s original blend space and the second picture is showing the character with the retarget blend space

what can i do to fix/avoid this Z axis issue ?

thanks in advance for all the help.