Those are the ranks they have in Fire Emblem Awakening.

http://www.serenesforest.net/fe13/sword.html
http://www.serenesforest.net/fe13/lance.html
http://www.serenesforest.net/fe13/axe.html
etc

You also have to remember that this is PvP. In PvE it's ok to have those higher-tier weaponry by lower in skill rank (although this was changed in Fe13 despite no PvP).