2d Sprites Inconsistent

Hi, all!

I am making my first 2D game, and am interested in creating a grid. My single grid piece is a 100x100px square with a simple 1px border.

I set my camera to an Ortho size of 8, and created a vertical stack of squares. This is what I get:

The entire left edge is missing from each square! When I make the border 2px, this is what I get:

But there is glittering! I would like for this grid to be pixel-perfect. How can I fix this?

Thanks! - YA