Netskope Senior Software Development Engineer In Test (SDET) interview questions

I had given 5 rounds of the interview and didn't get feedback till next 6 days and the I called to recruiter to get my feedback and he said out of 5 rounds 1 round was not good and you are not selected. Note : As far as i know all my interview rounds went very well but please don't decide the result on any one of the rounds. If this is the case, there should be an elimination round. Why Candidate should spent another couple of days even you have decided to reject the candidate