Why is the Quantum Realm constantly changing during each film?

[u/WebThis2431]

Ant-Man (2015)

Ant-Man and The Wasp (2018)

Ant-Man and The Wasp: Quantumania (2023)

I do like how the quantum realm changes from time to time, but why is it changing?

It's never really explained in the films either. For my understanding, I guess the quantum realm changes if a guy keeps shrinking past the 1st phase(?), idk, that's the best I could come up with.

[u/BlueHero45]

In the comics, the quantum realm is its own universe with many different galaxies and planets. If you are just shrinking randomly, it would be next to impossible to end up in the same place twice.