UI Raw Image placed in 3D world, when I press game mode to test them they move out of view.

I am placing art work up in a gallery. I placed them all where they needed to be. When I go into game mode, and walk my character over to the gallery they were all gone.

I had this issue before as I am using a terrain loader tool (so it loads as the game renders each terrain so it works quicker) and when I would place a building inside that specific terrain, I would go into game mode and the building would move like underneath the map out of view. I somehow.. managed to fix this but i have no idea how, it was a happy accident at the time. It hasn't happened since. So I am back here again with the same issue. Here are some screen shots: here you can see that I have got all the images that ended up underneath the map and moved them back up to the gallery but, they are all messed up now so I have to go place them again. I dont want to do this until I find a solution, because I am assuming the same thing will happen again, I will try again and update this if so. On the right hand side, the thing that caught my attention was when i click on 'ARTWORKS' game object, there is a comment that says 'some values driven by canvas' which I assuming means the canvas for the raw image... but I dont know might be significant..

So here is how I have organised the hierachy, in terrain 3_3 I have add to the art gallery, 'artworks' where I have added raw images and replaced the image from none to the art work I wanted there. rezied each one and.. in my opinion that should just work.

ANY IDEAS pls help :)