Are you just running forward and then stopping here? This gets me repro for the broken fingers issue I have been looking for, but I don't get the flipping or closed fist. The closed fist is only being used on reverse wield knifes, which is why the knife is flipping around. It is playing the wrong run animation for that knife.
If you have any ideas how you got this to play let me know so I can fix it. Thanks!