Title is confusing. Correct me if I'm wrong, but Quantum Mechanics is the interpretation of the very small, so the title is essentially 'Have we been interpreting the interpretation wrong this whole time?'
Quantum mechanics in this sense refers to the (very well researched and understood) mathematical theory. This theory permits multiple philosophical explanations of what is 'really happening' to give the mathematical results that we confirm to be correct in experiments.
Any debate about the interpretation of quantum mechanics refers to to this question of what really happens, not to any details of what QM actually predicts will happen. That is, until/unless experiments are devised to separate these philosophical explanations, but nothing much has happened on this front for decades.
