Why is the everything upside down when looking from a top-down perspective?

So I'm making a game that will be mostly in 2D, besides being able to zoom in and out, and I've hit a snag where I just realized that everything is upside down from the player's point of view. Obviously I could just rotate the oriantation of the camera on the y-axis by 180 degrees, but then the x-axis would be flipped instead, which creates a whole new problem. Is it possible to invert the z-axis maybe?

https://imgur.com/a/BgXWT41

I put some decals on the hexagons to demonstrate that it's upside down.