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The truth of the matter is that we don't really know.
Science used to use "heavenly spheres" to calculate the movements of planets back when the earth-centric system was the leading theory. When the observations didn't match the predictions, more spheres were added to adjust.
Now we are doing the same thing with dark matter. We can't explain how galaxies hold together, so we make up some placeholder substance that makes up the majority of mass in the universe, but is undetectable, and call it dark matter. It's just like adding more heavenly spheres.
With the Webb telescope we are finding lots of stuff that doesn't fit our model, which is kind of like Galileo observing the moons of Jupiter for the first time. All of these new observations are showing us that out current model is possibly way off.