Physicists often talk about how the predictions of quantum mechanics have never been proven wrong. But you won’t hear them say, “except that time we predicted only a few mesons, and we actually got a lot.” The stuff of quantum mechanics is probability. Apparently, the equations gave them the wrong probabilities.
This does not prove Quantum Mechanics wrong. QM is a framework within which theories about how particles and fields interact can be constructed. It's this framework which has always held up no matter what kind of interactions are being considered, and there is no exception in this case.