BDP International Systems Engineer interview questions

Very weird interview process with the company. I originally applied to another position a few months back, I had a phone interview with them and it went well. The managers even said they would bring me in for a face to face. A few days later I get an email from their HR recruiter saying they passed on hiring me. Strange! I then applied to another position, got another call. This time they brought me in for a face to face right away. They then set me up with a phone interview. It went well again. I was told the interview went extremely well. Next thing you know, a couple of days later I get an email from their HR recruiter again saying they passed on hiring me. Beware of their hiring practices. Not sure what strange things are going on there.