Okay, its really simple. QHs and Paints are the same thing, the only difference is color! Yeah Paints are a separate breed now, but the APHA wasn't created until the 1960s because of all the crop out coloring in QHs and TBs. You will notice that the APHA and the AQHA have the same foundation stallions. So of course your horse looks like a QH, because its either a breeding stock or minimum white Paint. Essentially your horse is a QH, except his papers denote otherwise. Two Quarter Horses can produce a Paint, this is known as a crop out. It can be double registered AQHA and APHA, but the only way a horse can be double registered is if it is a crop out QH. We even have a QH with 2 blue eyes, which is a Paint characteristic. This goes further to show the close connection between the QH and Paint breeds.