I don't know you, so I will speculate that something else is going on. There are a lot of ways to not get hired.

For example, one guy I interviewed spent all his time asking about what benefits he was going to get. He had no interest whatsoever in what he'd be doing, and what the company was doing. No hire.

Unfortunately, such is commonplace. This gives the savvy interviewee an advantage - approach the interview from the employer's point of view. Save your questions about how much vacation you'll get until after the employer has decided to hire you.