I got demoted in the middle of my series

Today was patch day in NA and that means bugs will appear. The most noticeable for me was that my silver 2 account was demoted to silver 1 with 0 LP while in the middle of a promotion series. It was around the time where the old ranked select was put back in place of the new one for a little bit, and I had even won that game. I was one win away from my promotion and I feel like I was demoted randomly because of the glitch.