I'm using Blogger.
I have modified a bit the CSS of the template, though I can't find why each time a link (section) is selected it goes up. At first I thought it was some margin-top issue, but I don't find a problem with it in the actual CSS.
Since I don't know how deep I can go to a CSS in Blogger, I don't know what else to do. I tried using the inspector in Chrome but there's nothing wrong or I'm blind.
Take a look: Select a link from the top and cry with me.
Add the following css-selector: