Clarus Group interview questions

The HR team contacted me about an opening with their company, I spoke with the hiring manager and then another manager who didn't know that they had an opening. I had a call with another team member on another day during the middle of the interview I got an email from HR saying that we would not be moving forward with you. I think is so unprofessional, they should have mentioned that before scheduling the call and after the 3rd interview.