so i am porting Custom Robo's Ray mk 3 into project m, and after some tweaks to his animations, whenever he walks he just stays in place while the animation plays out.
https://www.youtube.com/watch?v=JQ6BmRLmRHU (https://www.youtube.com/watch?v=JQ6BmRLmRHU)
i can provide the pac files, if needed. :)
Please do, so that I can take a look at it, since this sounds more like a model problem than an animation problem.
I'd first check if the model starts off the bone tree as follows...
TopN>TransN>XRotN>YRotN>HipN
Then check if the TransN Bone is moving at all. Looking at the video now, seeing that the run is fine but the walk isn't... it most likely is because you didn't animate the TransN Bone.