Hi! Thank you for the kind words!
Regarding the issue, it seems to be related to the FBX version I previously uploaded for Godot and Unreal. Unfortunately, that version can cause problems in Unity. Since I include the Blender source files for the animations, Godot and Unreal users can export them in their preferred format, but it looks like I forgot to upload the Unity-compatible FBX files.
Please, download the animations from here: Human Melee Warriors FREE - Unity Asset Store
Sorry for the inconvenience, and thanks for your understanding!