The Axe sizes are normal. What is NOT normal is holding and swinging an axe larger than yourself. In a game that many things are not very logical and physics laws are totally broken let's at least have something that does make sense. I know it's a JRPG but this is one of the reason Western RPGs took over. They look more "realistic" compared to the Asian ones. You can make a fantastic world with fantastic creatures and magic without breaking too much physics laws and logical assumptions. Some axes are smaller than others and some are bigger than others but all are in the logical proportions. Perhaps its your gear that's too fat and makes the axe tiny.