State field in UK addresses

Little_Wheels
Tourist
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We get our orders from Shopify by exporting a csv file which we import into our in house system Recently we have noticed that the 'State' or 'County' field for UK addresses is being populated with a three letter abbreviation, 'ENG' 'SCO' 'WAL' for example, presumably to represent England, Scotland & Wales, obviously these codes are not part of UK address formats, and in many cases they are wrong, putting English addresses in WAL, and Welsh addresses in ENG. 

Any idea why this is happening? I'm going to add a routine to our in house software to strip them out but it would be better if they were not there in the first place.

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