Vueltas Soldier EP6

[[Admin]Slice]

hello, i have a little issue with some of the ep6 mobs "Vueltas Soldiers".
When you see them, they are visible to you, you can see they're model and everything, but after they can see you and you are visible to them, they start to attack you. While they are attacking you, they turn invisible. They're model turns invisible. Then after they are done with the attack or they stop attacking they are then visible again. I have never seen a problem like this so i have no idea where to start with this. All of the other ep6 mobs are working fine that i know of, like the Tyros mobs. if anyone has any information on this please let me know. thanks.