Character Lore is broken?

My Miko mastery is bugged or something. I can’t get the skin and title. I played Miko even after he’s level 15 and still nothing. I remembered Gearbox telling us the Lores challenges are glitches or something but I’m not so sure if it’s because of my issue. Another thing, I obtained 2 Miko legendary gear and I don’t know how that happened. Maybe that was somehow associated with my Miko mastery bug? Someone care to explain or help me fix this issue so I can get my master items?? Thank you! You’ll be of great help!