It's strange what it has done with your display. Could it be that it took both monitors as one, adding the sizes of both to get those 72"?
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.