How to make make an object look like an Opaque but still have Alpha fading effect?

I have a script it’s adjust the Alpha chanel size so the object is FadeIn and FadeOut.

But object looks like its made from glass or fog.

Here are some pic that showing my problem better.

Hi,
2 issues are possible to my knowledge :

  1. either you shader’s face culling is set to double sided
    2)or the mesh normal is double sided.