Illidan (evil) model file´s selection circle turns into a "halo"?

[O.A]

When entering a lower elevation with this unit, its selection circle turns into a "halo". It stays on the higher elevation and is above the Hero. This model file is the only one that it happens with. Can anyone tell me why this is happening?

It returns to normal when entering higher elevation. This is a surprisingly annoying bug...

Thanks for any replies

 

[iPeez]

Never see it. But what kind of problems is it causing lol?

 

[O.A]

It doesn't really cause any problems, it just looks stupid and is very annoying...

I've customized the model file a bit, but tried reseting it and this still happens... it's weird... and annoying...

 

[Dameon]

is the unit spawned or preset on the map?

 

[O.A]

It is spawned by the Create Unit trigger

I have many other heroes also spawned with this trigger the same way, yet this one is the only one with this problem