No moving face on Metahuman using blending mask

Hi everyone !! I have a big problem. I tried to import two metahuman character on my project and since that, It mess my main character. Before the incident, my character was moving perfectly. I could use all my metahuman animator animation on the face and rokoko animation for the body, with no flaoting head and with all the head movement because I used a blending mask on the head animation blueprint. But since I tried to import the other character, it’s started to bug. So I tried to re-import my character and that doesn’t work. I deleted all the metahuman data, import my character in a new project and copy paste the metahuman file from the new project to my main project and that doesn’t work also. Now, I manage to have my body animation and my face animation, but I’ve lost the head and the neck animation. Do you have any solution ? Thank in advance for helping me (sorry for my english)