It seems that some new functionality has been pushed to Meta Stack Overflow and Stack Overflow with regards to location entries. The rest of the Trilogy, and the Stack Exchange 2.0 sites, remain unaffected.
The location now has some form of auto-complete and validation. All previous entries have been auto-filled. For example, UK will expand to United Kingdom, and NRW to North Rhine-Westphalia.
Apparently, whatever you had initially listed as your location expanded to Norway. And the number 6 will expand to Dublin, Ireland.
I imagine it might be related to some functionality with Careers, but we'll have to wait for an update from the dev team for the real answer. For now, though, this'll be the basic gist of what's going on (rather than why).
In fact the dev team have just spoken - here