This list List of countries by GDP PPP per capita gives Equatorial Guinea a GDP per capita of 34,900 according to CIA and a GDP per capita of 24,817 according to World Bank in 2017. The differences are high and a GDP of 34,900 puts them close to countries like Italy and Spain (developed countries), when a GDP of 24,817 puts them close to countries like Argentina or Mexico (undeveloped countries).
In a similar line, this IMF source gives them 34,864 for 2017
and 22,709 for 2018 (drop of 12,100+ in one year?)
What was the GDP PPP per capita of Equatorial Guinea in 2017?