A lot of dark chocolate on the market contain milk even though they are not supposed to since they are processed with the same equipment. Some brands list milk in their dark chocolate ingredient label. Perhaps OP is very sensitive to that certain sour flavour.
But OP mentions dark chocolate, not milk chocolate
A lot of dark chocolate on the market contain milk even though they are not supposed to since they are processed with the same equipment. Some brands list milk in their dark chocolate ingredient label. Perhaps OP is very sensitive to that certain sour flavour.