I don’t know.
You can look in your the options table in the database. There should be 2 entries for each field.
option_name = “options_currencies” = acf field data
option_name = “_options_currencies” = acf field key reference
currency sub field
option_name = “options_currencies_currency” = acf field data
option_name = “_options_currencies_currency” = acf field key reference
You could search the table for names like
%options_currencies_% and look for any duplicates, or anything that does not conform to those.
There could also be a conflict with something else, it could be completely possible for something else to be using the same option name.
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