Hi,
Welcome to our forum and thanks for contacting us with your question!
The discrepancies are due to the data in json. The best option would be comparing two identical keys codes instead of names. I don't have any experience with ALK Maps, but maybe they have any key/code that would be matched to hc-key in the highcharts .json?
As a workaround, you can also overwrite the json itself.
Demo:
https://jsfiddle.net/BlackLabel/h1ezax2c/
If you have more examples of invalid county names, feel free to report them here
https://github.com/highcharts/map-colle ... ist/issues .
Let me know if you have any further questions,
Regards!