Okay so I was planning on enchanting for a while and i was farming xp in the nether with the nether quartz and i was able to get the 30 levels that i needed for the unbreaking III enchantment but when i enchanted it i also got fortune II and efficiency III along with unbreaking III. i havent played played minecraft in a while and there's a lot of new things in the game so im not sure if this is normal or not and i havent seen anybody else talk about this.
extra info: I have my bookshelves in a 5x5x1 formation with the enchantment table in the middle, i was enchanting a diamond pickaxe, and the only mod i have downloaded is the lucky block mod