CINC Systems interview questions

Initial interview with recruiter went very well. Within about 15 minutes, I was told that I was being moved to the next round as I checked all of the boxes and met all of their requirements for this role. After not hearing back to schedule the next interview, I followed-up via email with the recruiter but received no response to those attempts. I finally received a very, very generic rejection email. No feedback and no reason as to why I was being rejected after being told I was advancing to the next round.