Happened t me last year. I bought a dozen at Baltimore, and loved them. When I got home, I ordered another dozen from a reputable sponsor, and they were much stiffer. Can't use them. I had merrily and naively cut a few to length, so I am stuck with these things. Maybe I can make a "willow back rest" with them.
Bad part is, I dunno which batch is the right spine, as they don't measure spine with my tester, evidently. So I went with another brand, which seems fine. So far.
Killdeer
Killdeer