this problem comes in V.15
if you see the images attached, some images came over the layer4 in the HTML. In the file are under this layer, but at export, it happen.
you can try it at by clicking in any PDF icon (it will open a pdf file in new window, but make visible the layer 4 at same time) in
http://highprecisionsupply.com/tennant/ ... oras.html (this page was modified and exported with v15) if you go to another page as http://highprecisionsupply.com/tennant/barredoras.html, this is not happening (exported with v14)

