Shadow not solid when using dynamic light in mobile

Hello, I am trying to configure a project for Android, to create shadows in dynamic meshs.

I have followed the tips of this post:

https://forums.unrealengine.com/development-discussion/android-development/41661-tip-how-to-enable-dynamic-shadows-correct-reflection-maps-on-mobile

I have made progress and of course my dynamic objects project shadows but both, they and my static objects, are suffering a problem in which they seem to be hollow when they approach the surface on which they are going to be projected.

I enclose the following photos in which you can see how the project is rendered on pc (where everything goes well):

And the problems that I have in mobile.

The green objects are static and the white ones are dynamic but as you can see even the cube that is static has this problem.

Please someone knows what I am doing wrong or what can be the solution? (All these objects I have created with the tool of unreal, they are not imported so I guess the problem is not due to something related to UV mapping or anything like that)

Thanks In Advance!!