This is better explained with a screenshot:
Grid parameters are as follows:
- Major Grid Spacing: 4 px (black lines in the screenshot)
- Minor Grid Steps: 2 (pink lines)
- Snap to Grid
Objects and edges are aligned to the grid. The square that is resized is initially 8px wide. When resizing, I can make it 12px, 14px, 18px wide, but not 10px or 16px wide. Why?