Luminus Management interview questions

Receive phone interview from hr, and have an on-site interview with a senior quantitative trader. Most interview question are about resume, and easy statistics and programming question. Receive email invitation of second round interview, but it seems that the HR forget the invitation and when I follow up the schedule and location of the second round interview, do not get a reply, and when finally get a reply, it is a rejection. (No idea why the second round interview cancel.)