Well the animations don't just change themselves. So either you set it like that on accident, or you have an event command somewhere forcing an animation to be played. Either way, you'll have to go through and double check any of the enemies' skills to check and make sure they have the correct animations. Then if the names are right, double check the actual animations in the database and play the animation from the database. If the error occurs there, then re-create that animation minus the errors. If there's no errors, it's an eventing issue.