To reproduce:
1. Open attached project. It contains a mesh with a shadow
2. Open up the frame debugger
3. Navigate to the Shadows.RenderShadowmapDir and select "Draw Mesh DX11_Explode_Cube"
4. Look at the game window, a shadowmap can be seen
5. Resize the window - make it small. Notice that the shadowmap starts clipping through the top left corner of the window - it shouldn't

Explanation:
As you resize the game view window, the game view is re-rendered, and the shadowmap gets projected onto a different area. So you see a different shadowmap.