Some custom meshes won't cast shadows to Water Plane

Hello,

I have some meshes in my scenes, and I noticed that after building lightings (I also have a lightmass importance volume) that some meshes are not csating shadows. this makes the scene look very off, as some of the meshes do cast shadows.

http://puu.sh/qGXB6/85335b8435.jpg

I thought maybe it is some properties that I missed, but I have checked them and they seem to have the same properties!

http://puu.sh/qGXDb/8b39bdd2ca.jpg

I thought that maybe the origin is below the ocean, but that does not seem to be the case.

http://puu.sh/qGXFw/e78b2d1dbe.jpg

Finally, I thought that it was due to the material, so I applied the same material that the object that casts the shadow has, and still no change.

http://puu.sh/qGXKR/ef41b6d682.jpg

Thanks for the help!