Ohana transparent textures

[Didus]

Hello,

I have problems while trying to edit textures with transparency.
Ohana replaces transparent textures with another color and I don't know how to put it back.

Here Pancham's iris have some big grey rectangle around the eyes instead of a transparent texture.
Even if I put the transparency back with photoshop or any image editor Ohana keeps replacing it when I insert it back.

Is there a solution about this ?

 

Thx