Pictures in emai builder 2.0


We are having some problems with that the same pictures that we are adding in our emails is acting different, regarding size and padding, when we are using the same picture from asset library in different emails. 

We are doing the same structure at the beginning in all our emails and we don't understand why the picture is acting different. 

In one email the pictures size is 590, what we want, and in another email we can't get the same picture to bigger then 580.

How is that?