There are steps you can take if the currency displayed incorrectly and changing the user's default currency does not fix it.
For example, my organization only uses British pound (GBP) - other currencies are inactive - and the custom currency fields show the amount in Euro (EUR).
The user record contains two currency fields, known as DEFAULTCURRENCYISOCODE and CURRENCYISOCODE.
To fix the displayed currency on the record you would need to use API, for example, the Data Loader. Follow the steps below:
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