Animations being switched to but not playing

I've made a simple AI behavior for an enemy actor but its animations, although they're being switched to, are not playing correctly. the "warcry" animation is the only one that plays correctly. the "walk" and "attack" animations both get stuck on their first frames.

any help would be appreciated.

Have you try to replace the working animation by one of the "faulty" ones .. ?

or replace one of the faulty ones by warcry ..

just to be sure that the problem is not coming from the animation itself .