Observations close to the Iguazú River on the Argentine side appear in Brazil. Two examples:
There the map details have the wrong country but the correct Argentine province: South America - Brazil - Misiones, AR
There the Brazilian state is also incorrect: South America - Brazil - Paraná, BR
Would it be possible to add some angles to the corresponding polygon so that it follows more closely the course of the Iguazú River which forms the border?