Infernal Dragon in Moutain Rift

Last game there was Infernal Dragon despite it being Moutain Rift. The order was Infernal, Ocean, Moutain, Infernal.

This is example of how four slain dragons should be displayed normally. http://i.imgur.com/6V97uUs.png

This is the bugged game. It completely ignored the Moutain Dragon that defined the rift. It even states four were slain but skips the third. http://i.imgur.com/HXmD4DO.png

Don't get me wrong, it's a nice smiley picture but that Infernal had no business burning in the lands of rock.