Is this some sort of typo or weapon mistake?

[Sven Osymthe]

It's no typo. There are multiple weapon classes and multiple names. You can get more than one class with one name.

Rarity doesn't really matter, although it just tells you, there will never be a normal orangutan repeater, or famed orangutan cutlass in your case.

[Raikel]

The weapons system is overrated. They have Rank 3 sure foot that does the exact same thing as rank 1 sure foot. Healing boost heals maybe 300 health, and certain enemies do 300 points of damage when you are casting the spell. Nothing can help the system, because Pirates still has invasions that glitch up even after they 'found' a patch for them.