The shrotinger equation isn't a random equation. It's completely determined. When you open box, you don't know which branch of the way function t t you're going to be in. This rule is about figuring out the probability that you'll be in the branch with a living cat or a dead cat. So then there's two copies, but somehow you're more likely to be the copy that sees the living cat dand this is another part of the problem, right? Because quantumphysics famously only gives you answers in terms of probabilities most, almost all the time.