Revolution Crossbow: Bug or feature?

Revolution Crossbow
Crossbow - Bowmen only
Required Level: 30
Weapon Attack: +51
Normal(6)
7 Slots
Tradeblock
One-of-a-kind

Level Up: 8 times
Weapon Attack: +(2~2)

With this info, a level 3 Revolution Crossbow should have 55 attack.

It's the same on JMS, too. My level 3 cross bow has 56 attack.

Also apparently it can go to lv 9, at least mine is still getting exp at lv 8.

nvm.

Also apparetnyl it can go to lv 9, at least mine is still getting exp at lv 8.

That's implied in Fiel's extraction.

That's implied in Fiel's extraction.

Oh that's right, I didn't count lv 1. I though it started at lv 0. Sorry >_>

It gains 2-3 attack per level.