Distance Field Shadows passing through objects!

Hi all, I encoutered a problem with Distance Field Shadows. All my scene is made by Static Meshes, I made a build and all went right. Lighting is simple: there are some Spotlight on the ceiling, no skylight, no direct.

I introduced another mesh, the one with dark gray metal material. It is a Stationary mesh with Distance Field Shadows enabled. There is one spotlight above, with Stationary property and Distance Field Shadows enabled. All is going well except that the shadow seems to pass through that shelf ! Am I missing some setting? I tried to increase the distance field resolution under the static mesh properties, but nothing is gonna change…

Here you have the screenshots. Thanks in advance for any helping answer!