Why do Nadi / Bhrigu astrologers get the facts about past correct ......

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Why do Nadi / Bhrigu astrologers get the facts about past correct but future predictions are all wrong ? .....I have been to a Nadi astrologer from Tamil Nadu ( India ) and a Bhrigu astrologer. Both were absolutely correct about events and facts from past but their predictions turned out to be wrong. I have read answers here about others with similar experience. Is it so because these astrologers got the facts about past from my own words in a casual manner beforehand and then just pretended to read them out ? Or is it because of some other reason ? Has anyone else been to Nadi or Bhrigu astrologers ?