The Sun sign and the life path number answer two questions. The first places the Sun in the zodiac at the moment of your birth; the second comes from an addition of digits, after reducing each part of the date. Two people of the same sign therefore often have different life path numbers, and vice versa. For example, a birth on April 21, 1990 gives a Sun in Taurus, whose traditional ruler is Venus, and a life path number 8, which the site’s convention links to Saturn.
Nothing requires the two readings to agree. When they contradict each other, you can see two nuances of the same person, or keep only the one that speaks to you. When they overlap, it is not proof: it is a coincidence of vocabulary.
As for the master numbers (11, 22, 33), they take the planet of their reduction. Not to be confused with sign rulerships, which follow a different scheme: Mars rules Aries, but it is 9 that is paired with it, not 1. This table is used in no calculation of the report or the chart.