In visitors -> geographic situation,
In the graphic, by default, the cities and the regions are not listed in order from biggest to smallest according to visitors numbers.
FYI, this issue is still present in 1.9.2
Did you click on the word “Visits” at the top of the third column?
(I’m assuming you did, but just have to ask to avoid an improper assumption.)
And which icon in the lower left corner of the widget do you have activated?
I’m talking about the default order.
If I click on UNIQUE VISITOR it orders properly.
It’s just that by my point of view, if por default it can order the value, it should be nice 
Exemple of what i get by default :
Ile-de-France, France 132
Inconnu 93
Quebec, Canada 84
Rhone-Alpes, France 58
Provence-Alpes-Cote d'Azur, France 38
Nord-Pas-de-Calais, France 23
Bretagne, France 12
Centre, France 17
Languedoc-Roussillon, France 24
Pays de la Loire, France 22
The last 3 are not in the correct place.
By the way, you can see it on the online demo.
Select 10 rows and right now you will see Ontario, Canada 10 on line #6 and Hessen, Germany 18 on line #7
Same for cities. Without changing the number of rows, right now on the online demo you can see Hamburg, Hamburg, Germany 11 on row #4 and London, London, City of, United Kingdom 14 on row #5
We need YOUR help! We are running a crowd funding campaign to raise funds to implement the detailed Visitors Maps of Countries, Regions and Cities (for all countries)!
These maps will be beautiful, usable, and built using open standards SVG+JS. They will show detailed visitor count, conversion rates, by Country but also (New!) by city and region.
Pledge now at: http://crowdfunding.piwik.org/analytics-maps-world-country-city-region/
There will be no more flash in Piwik and we will add amazing new Maps of your visitors.
Piwik needs you!