Adyen Linux System Engineer interview questions

Went through 4 rounds of interviews. Got rejected based after the last interview with CEO saying there was only a “normal yes” and no “strong yes” from interview rounds before. I later heard via recruiter this is not the first time this has happened at this company. CEO interviewed me from his kitchen and seemed distracted and asked weird questions. They actually wanted to come back me after they rejected me to re-do the 4th interview. I declined. Why do you want me to redo the interview, if I passed all interviews and you are the one who are making decisions based on bad internal communication. If this is experience was a preview of working for this company I do not want to work there. Biggest waste of my time in my life. Job hunting is stressful and time consuming enough for a company to waste interviewers time based on arbitrary decisions and bad communication.