These are straight, parallel roads (made with a single drag, so no like, plop a section, then plop another section) on a flat surface. and I keep getting weird gaps and misalignment and other stuff that is observably minor but is making me want to rip my goddamn fucking hair out with how its screwing up symmetry and other stuff.

The only thing I can find about this is to disable various snappings and to make sure the land is flat. I have redrawn this area like 2 dozen times trying various combinations of snapping and not snapping settings and it still does this same damn shit, and the land is flat.