I played TFT at about GMT 12:00, euw server. I placed Morde, Sej, Poppy, Garen, Kayle and Leona+knight gear, I didn`t get 6 knights buff. It was always 2 knights/4 knights. I tried to place them down and put back to battleground again and it works, I got 6 knights again. Just I need to do this every turn.
So there might be some problem that the system cannot detect what buff I got. Hope you fix this ASAP.