[atlas] Lowercase country codes in the probes database

While using use probes database at ftp://ftp.ripe.net/ripe/atlas/probes/archive/ I noticed that 33 probes have country_code values in lower case (e.g. "ru" instead of "RU"), some in "Connected" state. When trying to distribute probes evenly among available countries it obviously affects the result. Of course, it's easy to work around once you are aware of this 'feature', but I only found the problem by chance. I wonder what's the story behind this and can this be fixed? (Web-interface doesn't seem to be affected.) -- With Best Regards, Marat Khalili