Siemens Intern interview questions

I applied for three internships and was contacted by a recruiter for one to arrange a screening. After setting that up I immediately received rejection emails for my other two positions as if they felt that I could only interview for one position at a time. After my strong interview and positive feedback from the recruiter I felt hopeful that I would move forward in the hiring process. Instead I got a rejection email two days afterwards stating they would be going with another candidate. I did not even get to meet with a team or manager! How was I evaluated fairly? To make the experience even worse they left the internship job posting up on the career page. So there was no “other candidate” just uppity people who would not even speak to me before discarding my application entirely.