Use Change Actor Graphic to alter your battler. That's the only way I can think of on that case. Sounds strange, I know...Make sure there is a Battler Graphic it is directing to, and go into an enemy processing.
It may be the way the actor is facing, the certain direction for example. Try another Move Route and test to see if it works, if it does, then there may be another problem. If all goes wrong, you may need a Direction Fix. D: If you're really in a pickle, you can always show us a screenshot of your problem. (You know, the Print Screen procedure)
If anything doesn't work, just go into a clean project or clean map and try to emulate the problem (i.e. Make the problem on purpose and see how you can correct it).