maps

Hello, I am using version 2.58 (may 18). I can see Canada in the map only if I use the 2 letter country code CA. As soon as I switch to 3 letter, I don't see it anymore on the map. I have created a simple dataset with the G7 countries. In the first column I use 2 letter cc for all the countries, and in the second one I use 3 letter cc . My map works well with the 2 letters cc, but with the 3 letter cc I only see 6 countries...I didn't have any category associated with the columns, but I have tried to tag it to 'Country' a few minutes a ago, and it still doesn't work. I have solved the issue by using 2 letter code so it is not urgent anymore, but still, I don't understand what the problem is.