Kittyhawk interview questions

It had 3 parts. They asked all questions that they need, of course I had tried to answer with my best. Then they sent me a link to set for the next appointment. So after all interviews I just simply got a reject. This is so odd process. Because these things took my one week of time. I'm really confused about it.

- Call with the recruiter - Call with the manager - Take home exam (24hr) - a series of 3 exercises related to stress analysis - Panel interview (1hr presentation) followed by one-on-one's with team members