I've noticed this before and it's fresh in my mind after a couple of days of interviewing.
The employer wants the candidate to be the one.
The candidate wants the employer to be the one.
The employer wants the candidate but the candidate picks another job or doesn't like the employer and turns them down.
The candidate was just checking out the employer.
The employer was testing the market as they didn't really know what they wanted.
The candidate wants the job and thinks the employer likes them but they don't.
The chemistry in the room can be palpable and misleading.
The employer persuades themself to employ someone who doesn't quite fit because they need to fill the role.
The candidate needs a job so takes one they don't really like.
Compromising on key values rarely works out.
I think that's enough, you get the point.