TFT notifications in client

Unlike all the posts I've seen regarding TFT notifications on the league client, I actually do play TFT and claim all my rewards. Nevertheless, the notification never goes away. Is there anything I can do to fix it? Is it a bug? Am I the only one this happens to?

EDIT :

It seems to have randomly disappeared, but I think I can explain how it happened. I had 3 missions active and completed two at the same time. However, I was able to redeem 3 quests, as a "new" completed mission scrolled in as soon as I redeemed the first one.

I guess it was one of my previous missions that was pushed out of the window by the new ones, which would explain why the notification has been up all week.