ArcScene projection makes aerials look "separated"

Hi, I have a arc scene that I am trying to overlay some cad drawings
over to simulate a mining site and viewsheds.

When ever I set the projection system of the layer frame to match the
cad date the rasters (aerials) that I'm using all seem to separate in a
pattern basically like they are each separate by a 1/4 inch before
changing the coordinate system they look like one continous raster like
they should look.

What can I do to correct this?

thanks,
Oscar