Gallagher Senior Process Analyst interview questions

It was very long. I went through employer Walk-in and it was really time consuming i start off the at 11am and walk out at 8pm. having said that i've cleared the assessment round but later the next day i get a call from HR saying i had to give the round again. and since i had already given it once it was easy to crack but, still why do i have to repeat the rounds for no reason. the HR management is very weak. no accountability. no ease of process.