With the new L5 copper smelter (and potentially other L5 smelters, I don't have any others at L5 to check) there is a graphical glitch with the little round tower on the building. As you can see in the picture below, there are two separate circular roofs and smokestacks offset vertically a short distance.
http://forum.castleempireonline.com/...8&d=1328810313
