Weird Ok button appears after i try to accept a club

When i try to accept a club after pressing accept and going out of the club invite window i get a floating ok button in the middle of the screen. I wasnt able to join the club. The request is still open after pressing the weird ok button. Open the dropbox link for pictures <3

Here is how to try and reproduce the bug:

1. Make someone invite you to a club
2. Try and accept it through the club accept window
3. Exit the window
4. The button should appear

I hope this can help riot making leauge of legends a better game