Won't let me pick a champion from mission

Screen Recording 2019-12-09 at 51215 pm
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Just watch the video and you will see. It won't let me press view abilities nor select. HELP! I already quitted the game and opening it again but it won't work T-T ! I also tried hovering over the part which shows the buttons and then quickly moving my cursor over the buttons but it won't work. Is this a bug?
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