I encountered this issue too.
From what I understand, the .asset file is not saving the changes made in the Unity editor.
A solution that should work is to directly edit the .asset file manually by opening it in a text editor.
So in this case it would be: right click on the move -> Show in explorer. Open the file and delete the lines starting with "- {fileID: " under "previousMoves", then save the file.
Also, I don't know if it's your case, but UFE HATES duplicate moves, values from one move will sometimes override the values of the other one constantly, it's the kind of thing that trigger bugs like that.