Combine button not showing up when trying to unlock the vault in the Enclave Library

[Alex032691]

So I just received the Rune of the Wolf after rescuing Halsin from the Goblin Camp, and I'm trying to unlock the vault in the Enclave Library but the combine button isn't showing up for the rune. This has also happened to me when I was trying to forge the master weapon even though I was able to complete it somehow. There has to be a mod I have installed that's causing that to happen. Do any of you know what it could be?