F5 Senior User Experience Designer interview questions

Months after sending my resume for a position, a recruiter contacted me for a telephone interview with the hiring manager. It went well, and I was very impressed with the hiring manager, who told me to expect an email from the recruiter about next steps. A couple of months passed, and then I received an email from the hiring manager asking me to come for an in-person interview. I did and thought it went very well. Another month has passed and I've heard nothing. The position is still advertised. I was very excited about this position but subsequently accepted another job. Not sure what's going on at F5.