Animation is Glitchy at Times, Character Glides or Repeats

I followed this tutorial, and it may be my mistake but I don’t have all the animations, so I only did what I could. According to the tutorial, there was “prone” and some other animations for a gun simulation game which I cut out of my project because it is not a gun simulation. My character can change from idle to walking, but while walking she moves back and forth, repeating the animation and not smoothy continuing. How should I fix this? All help is welcome. Thank you.