Cuboid scaling incorrectly?

I've got a bit of a strange one. It's entirely possible I'm missing something obvious.

For some reason, my Cuboids (sized in meters), don't scale properly with camera distance. When the camera is close, the Cuboids render accurately. Then, as the camera gets more distant, the Cuboid's scale seems to grow (visually). The actual transform scale does not change, just the visual representation.

Any thoughts on what might be happening?