Explanation 1: The universe is not random and doesn't have cause and effect. All scientific experiments appear to work because the whole universe is actually a movie playing out where each new frame has been edited to produce the results we see, but for some reason the author decided to never violate QM.
Explanation 2: Unlike what QM predicts (true randomness) there's a finite amount of randomness added at the beginning of the universe, enough that our experiments appear to follow QM, but eventually if we looked hard enough there would be a predictable result with finite entropy. So it's actually regular determinism.
A few people claim #2 is true and doesn't imply #1. Everyone else thinks they're the same and doesn't like it for philosophical reasons.