I used animations from Mixamo for a game project, a humanoid character (ybot). I used an add-on called Godot Game Tools to combine different animations and duplicate them. I duplicated the animations and modified the rotations of spine bone and replaced the key frames. When I opened the project later the animation had some unwanted transforms in it. The character is shifted slightly to up.
When I was modifying this animation there was no such problems, when I changed the animation to something else and back the problem occurred. Every animation I made this way has problems like this. I did it yesterday and I noticed this today when I opened my Blender project.
As a workaround for now I opened each animation and changed the transform of the hip bone individually. I have to again modify many animations to correct this.
Is this a bug ? What causes this problem and why ? How can I fix it ?
Edit: Here's the blend file