The grid is not displayed correctly.
Description of the issue
When an object is aligned on ALL sides to the grid, the left and the lower side are ON the grid line, but the upper and the right side are BESIDE the raster line (see image).
This means: If you put two of these objects next to each other, the two 1pt-borders look like a 2pt-line.
If an object matches the grid, it should be placed on all sides ON the grid line.