Unfortunately you panned away at the moment of gameplay where you would actually see the root motion moving up or stutter, so i can’t really tell whats going on.
Just to mention the Id10T error I made often enough. Make sure that root motion is enabled on the montage itself.
Another issue. When the attack starts you need to trigger the movement mode to something OTHER then “walking”. Or else the root motion Z may be ignored.
last bit from docs:
“The physics state of the Character is taken into account during Root Motion. For example, if the character physics is Walking or Falling, then the Z-axis of Root Motion will be ignored, and gravity will be applied. Characters will fall, go down slopes or up stairs. If the character physics is Flying, then the full Root Motion is applied and gravity is ignored.”