MatFx Rust weathering normal channel not working ?

[zaikoninn]

Does anyone know why this happens everything works expect when i try to enable normal channel for rust weathering FX? 

Heres few images of the problem and how i setuped it: 

https://gyazo.com/a6758b9fe6b245bd66583b0a83327d73

https://gyazo.com/7876bb828b420f7a24ccf213502534a4

https://gyazo.com/4036b6fbbce17507d2ca50ca1ae3ebb2