Some countries – marker doesn’t stay put

Hi, I find that some countries don’t seem to be found automatically, and if I type the country name in to the Location box as I am editing the category, it shows up, but after I save the marker has gone somewhere else. For example ‘Argentina’ after saving is showing a marker somewhere in Arkansas. Last time I looked Argentina was a bit further South?

Can you let me know if I’m doing something wrong?

Thanks in advance.
Kitka