why does the back object not illuminate in reality 2?

Drekkan

I am using daz3 by the way although I don't think it would matter what version I would be using as the problem would probably be the same.

I am trying to illuminate a back part of a picture. As you can see in pic 1 I have point lights set up around M4 to make him really bright and also 1 in front of the clothing item in the background which I am expecting it to be illuminated by.

When I render this through in reality 2 (pic 2) I see the point lights effects on M4 seem to have worked as expected but with the clothing item behind him it seems to have not changed at all and you can barely see it. I expected the point light I set up in front of it to have shone some light on it but this has strangely not happened.

Is there a reason for this and anything I can do so it works? I really don't see why this should happen.

thx.