Changes don't get rendered

@nevw: Thank you. But I don't want to lose my time adding information that never appears...

Because there are essential tags missing, as already explained by nevw. We cannot render everything because otherwise the map would become too cluttered and unusable. That's why only objects with specific tags get rendered. Your office will get rendered if you add the building key, for example building=office. The ticket shop should get the tag shop=ticket instead of shop=ticket_shop. And your station should get the public_transport=station tag.

OK. Thank you very much. I didn't get the relationship between the lack of information and the fact it wasn't rendered. However, the choices seem very limited. For instance "shop=ticket" seems not to work, and the list of shops is extremely short. [http://www.openstreetmap.org/way/292145746 Don Bosco center] is another example of not-in-the-list building type: a youth centre. I also have a rental service shop: not listed. Moreover, adding "public_transport=station" to the coach stations didn't make them appear.

Please be aware that not all editors list all possible choices for shops. Take a look at http://wiki.openstreetmap.org/wiki/Key:shop for the list of shops that is documented. Note the 'user defined' at the bottom. So you can add any type of shop you want. However, it's better to also document it on this page if you start using a new value. On the other hand not all shops are rendered on the default map. The humanitarian rendering (available from the menu on the right) shows all shops.