Did you check that 3 variables in your code are in the same range? I tested on mine with 3 individual Analod input and have same report based in the first analos input. this not work as expected.
@@wayanputrayasa7851 i solved, basically this method doesn't work. And even looking at the code you realize it has no sense, you read the same raw value in [0] and [1] , like Oussama say. The only method you have for reading multiple ADC value is to use DMA.