sorry for some reason in cam in huge and twice. But I hope this is what you where looking for.
[/QUOTE]
In the “go advanced” mode you can delete those “extra” pictures -> just click onto the “manage attachment” button and then delete them from the “add to line” list.
Now to your problem 
-your lightmap looks correct, but do you probably get any light errors when you build the light?
-with: “only happens when the light is rendered” you mean after you have build the light?
-your mesh is one single mesh or have you combined it in the editor or import window (combine meshes)?
-check if your normals are pointing into the right direction
Or the easiest way is to upload the mesh somewhere so that we can take a look at it