Amazon Software Development Engineer, interview questions

online oa, then 3, 1 hour long technical and behavioral interviews. first 2 interviews went great but 3rd interviewer was uninterested, uncaring, disrespectful and lackwd knowledge of basic functions having me explain to him very basic things

I received the online assessment some days later applying and, despite being said they will answer in 5 working days, I got an answer in two weeks. After this, there was an on-site interview with 3 different Senior SDEs, that were asking behavioral questions and then coding. They were all really nice, I did all the coding questions and they seemed to have a nice talk with me. I got rejected after this on-site interview without having any explanation, even though I think the interview was good overall, I just would like to know why I was rejected.