Juni Learning Math Instructor interview questions

They interviewed me and made me go through a mini lesson for computer science first to see if I was fit for the role. I was instantly rejected without any reason after I spent 50 minutes on the interview in addition to prep work. They gave me another opportunity to interview for the math instructor role. I emailed them to ask them how I could've improved and they took 10 business days to tell me that they were unable to give me feed back on my previous interview. I went along to interview for that math instructor role which consisted of a very similar mini-lesson. Instantly rejected the next few days. Honestly, I'm not sure what they are looking for and a complete waste of time. They don't even pay that well.