Map width does not expands properly

Hello,

I recently upgraded the site from 4.6 version to 5.4. After the upgrade the width of the map is not full page width allthough map settings are the same before the upgrade.

Have a look at pages in English and Greek.

In addition in the following page of Lodon the map is full width in English and short width in Greek.

Why does it happens? Any idea?

The page I need help with: [log in to see the link]