Animation walk&run issue

Oh It’s not my animation that I’m trying to make. it’s others that I use to play in my game, see I’m trying to make a machinima and for example for one of the animation that’s having the problem it’s (Steven studios) walk animation my sim will walk but glitch as if it ran into a wall nd look blurry nd in 2D nd my sims headline Diamond I can see it moving but my sim is not moving with it she like turned invisible then it will loop the animation but it will just do the same thing where I can’t see the full walk bc it would glitch out maybe when I’m back on my computer I can try to send a picture so anyone can see what I’m talking about