After some turns I cannot reproduce the issue.
That brings me to an idea:
Please delete the Global map from within the game Map-Downloader.
After that close TripleA , restart TripleA, and redownload the Global map with the Map-Downloader.
Try again.
In case this does not work please try running the latest pre-release:
https://github.com/triplea-game/triplea/releases
In case there is an issue it might have been already fixed during the last days.
Then try again.
But before please answer to my last posting.