I'm probably missing something obvious,

I got 2 SR weapons same name (divine moonlight bow) that won't let me break limit them first i thought it was because 1 had a higher weapon skill level on it but thats not it.

Every where i read about it they only say it has to be the same weapon.

what am i missing, something with the skill level or the weapon level.
Or should i have not leveled them at all until i break limit them first. It's worked just fine with all my other weapons.