Just had a weird internal job interview. [View all]

The back story:

I work 20 hours a week at a public library. My branch requires I work every Saturday, whereas every other branch in the system only requires an employee in my position to work every other Saturday. Because of that, if i worked in any other branch, I could pick up a second 20-hour a week job in the system and get 40 hours of employment. I would say at least 50% of full-time employees are "full-time" by working two 20-hour jobs.

So today I went to apply for a second job in the system. My supervisor was one of the interviewers! Basically, she attacked me for wanting a second job in the system because she would be down a worker two Saturdays a month. Remember: no other location requires employees to work every Saturday. She also disingenuously said that when she started as a librarian, she worked both days every weekend, for two years. Believe me, I do not make librarian wages; at 40 hours I will make less than 50% of her full-time librarian wages.

So I guess I'm asking:

Does this strike anyone else as strange/a conflict of interest? Does this rise to the occasion of contacting HR with my conflict of interest concern? As I understand it, HR just posts the jobs and schedules the interviews, they don't do any of the actual interviewing. That is left up to the clusters (library is divided into service clusters) to decide who does the interview.

What do you think, DUers?