After log out log in, the stats of my arms disappears

And for all arms please help me D:

Exemple : https://youtu.be/9v2P6Uv4ST4

You have to work out harder, feel the burn.
EDIT: I just watched the video, wtf. I assumed it was related to the actual weapon skills but that's weird.

It's not even a visual glitch as you can see that his HP is lower when he logs back in.
Nice bug.