IXL Learning Product Analyst Science interview questions

Process took ~8 weeks in total. Applied through Jobvite, had reference from a current Product Analyst. Got phone interview, no unexpected questions, similar to those described in other Glassdoor reviews, complete with jelly bean brain teaser. Was given job test, which I spent the full week on. Was called in to on-site interview - 3 hours, 3 different people, all very nice and asked fair questions about my background, teaching experience and how I would generate questions for the problem generators. Pretty exhausting though. Was then called into a second on-site interview to meet the other Science Product Analysts and had another interview with the heads of the team. After a few days, was sent email expressing that I was "not a match". I was utterly baffled by this decision, as I'm well qualified for this position, every interview had gone well, and they had expressed several times that they were "very impressed" by my performance. No clue what they're looking for.

I was introduced to IXL at my campus job fair. I went through three rounds of phone interviews spread over two months, each with a different member of the product management team. The interviews included general questions about my goals and achievements, science and math related questions, questions about pedagogy and the teaching process, and brain teasers (really fun!). In the final stage, I was flown in for an on-site interview, which also consisted three rounds. I was asked to teach a topic of my choice to an imaginary 5th grade student. I was also asked to brainstorm ways to explain a concept to students at different grade levels. And of course, there were more brain teasers! I found my interviewers very friendly and warm, and at the same time, keenly attentive to my answers, reactions, and questions. I thoroughly enjoyed the interview process.