Blen Rig Vincent problem

Hey everyone !

I have a problem with the Vincent rig. So I linked the character in a new scene and animated it for about 200 frames.
When I re-opened the file, the controllers for the fingers disapeared and new keys were added in the dopesheet. I deleted those keys but the animation of the fingers was modified due to the absence of the controlelrs (I know it’s weird…).

I’ve tried to put back the fingers’ controllers by using the layers in the “Data” panel of the armature. But it sometimes disapear again…and when it doesn’t, new keys are added in the dopesheet

Any solutions ?

Thanks !

Here is a link to my file :
https://we.tl/rVE5lZvtRj