Cycles render result different than preview

So i’m learning to displacement by image, to make a shiny font text in a business card. Then looked at it, it looks good, but why the render result is kinda different?

Here is the preview :

the result :

Look at the bottom Bandersnatch word. the reflection on the letters looks good at the previews. and the render it now looks subtle only.

I applied the scale btw.