Unity Data Scientist interview questions

the process is very strange It's not clear who checks the homework, I was interviewed twice in a row within a month (don't know how cooldown period works there). The first time they wrote comments what wasn't okay for them, and the second time I interviewed I took those comments into account to fix homework. Again reject, no explanation

First call with HR, simple culture fit call Technical call, quite basics and nothing hard Take home task, create prediction model based on conversion data. 3 calls with team, mixed technical and culture questions.