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I just created some obj-exports from Sweet Home 3D samples and got the same result: some textures are not rendered correctly.
I found out that no texture coordinates are provided for these objects in the obj-file. In such a case Java 3D's obj-loader 'ObjectFile' creates a 'TexCoordGeneration' instance with default settings for the plane equation coefficients which expect an object in the x/y-plane at the origen. Most likely pictures on walls are not positioned in this way. In consequence the texture is rendered in a weird manner.
Check out the Sweet Home 3D Forum if this issue is already known (http://www.sweethome3d.com/support/forum/index).