Allah says in hadith qudsi that no eye has ever seen paradise no ear has heard about it & no human heart has perceived but as we know Adam and Hawa were living in paradise before they were sent down to earth so they saw and heard everything there even Iblis knew abt paradise. pls explain the hadith.

There is no contradiction, the hadith is about what Allah has stored and hidden of the bliss of Jannah, not about every part of it that has ever been seen. The scholars said Jannah contains that which some eyes have seen and that which no eye has seen, and the greatest of it is what has not crossed the heart of any human (agreed upon).