I don't know why, but this only happens with one animation:
The TransN bone is one of the early bones in the list of bones. So originally there were some bones that branched off of it. The bones that branched off of it actually moved the entire model. So if I moved the TransN bone, it affected the branched bones, so the model moved with the TransN bone, AND the other bones. That messed up the animation. I moved the TransN bone down and it worked better. Except that it was still above the waist bone. Another important bone. And apparantly, all of the animation use the waist bone, so I cant simply remove it. And then when I tried moving the waist bone, the animations became screwed up.(that was my idea, which failed). So now I'm going to try extracting a fresh model of ichigo from the iso and adding a TopN, HipN, XRotN, YRotN, and ThrowN. Then see how that plays out. And then one bone at a time, add TransN bones.
If you have any suggestions I'll be glad to hear them.