Hey there! Since TFT is a game that supports crossplay, you use the same account to log in, no matter what platform you're on. If you're in the middle of a game on mobile and get disconnected, you can log into PC to be reconnected to the same game.
So, you probably entered the tutorial on mobile, and then logged into TFT on PC, is that right? The state in this screenshot is actually caused by the fact that the tutorial messages aren't yet visible on PC (we technically haven't shipped it there yet!). Sorry for the confusion there.