Most map projections dramatically underestimate the size of the Pacific Ocean:

https://www.atlasobscura.com/places/point-nemo

We’re just not used to seeing this half of the planet depicted, and the Pacific IS almost half of the entire planet.

It is centered on the Pacific Ocean, which is a bit unusual indeed

Looks pretty typical for an Aussie. Pacific in the middle.

This probably isn’t what happened to you, but my brain assumed the dark areas were the land masses for a good long while until I realized why it looked like a nonsense map lol