Are they lying about the horses?

Ok I've been looking for a horse thats maybe around 17HH, doesnt matter what type but mainly I've been looking at friesians and warmbloods. The sites that I have been on are www.friesians4all.net www.dreamhorse.com and lots of them say 16'3HH on the friesians4all one but the horse looks like its 13hh its crazy and its really bugging me, most of the horses I look at are like that are they lying about the size? My mother says the people are just really tall, but not every single person in the world is 7 feet tall.. Can someone please tell me where I can find a horse place in canada or the US that is true to what they say or please tell me what is going on with these people? thanks.