Did you buy them as starts?
I was sold a six pack of Blue Lake pole bean starts this year that turned out to be very short-lived bush beans. I pulled them a month ago, it was tremendously disappointing. I had built a new, robust trellis for them which was supposed to shade my southwestern window! At his time last year, I was harvesting pounds a week.
I've planted some Blue Lake pole bean seeds since and have about ten plants up, a few of them already vining. I'm hoping by the end of the summer I'll have some beans again.