G-Research Quantitative Researcher interview questions

I was notified by email that I was selected for an interview asking to schedule. I replied and then didn't hear back after a few days. I followed up again and still didn't get a reply. Eventually I got an automated rejection email. Quite unprofessional and not the kind of company I want to work for anyway.

Great experience, interviewers were nice and positive, they are not trying to make you uncomfortable, one of them was asked a very vague question, open ended that I couldn’t understand