Is that Job Posting a Lie?

Dear Evil HR Lady,

I recently applied for a Career Counselor/Coordinator position. I received a phone interview on a Friday as a preliminary to the in-person. During the conversation the interviewer admitted that it was more of a case manager position. That following Monday the position was retitled and re-posted as a Case Manager. This also happened previously when another agency posted an ad for an Office Manager, and during the interview I discovered that they really wanted an Payroll-HR/Office Manager. Both were non-profits, but is this the normal now? I thinking of withdrawing my candidacy for the former scenario because something just smells dishonest. Your thoughts?

So, Is That Job Posting a Lie?