kaisa glitch?

i was playing kaisa, and whenever i could upgrade a skill with the pasisive, a white square appeared in the left top quarter of the screen. So like, when I got upgrades for 2 skills, there were 2 squares. I thought it was only me until I saw Redmercy's vid and saw the white squares. https://www.youtube.com/watch?v=wq0jQNghq7Y look at 5:51, white square at left top quarter of screen.