It happened to me two times already since the new champion select, to miss click on some champion on the row above the lock in button when I want to lock in. As I don't get the instant lock in feedback, I move my mouse and click again to make sure I do lock in. I only then see that I will be playing adc nunu this game. In my other years with the older client and older champion selects I have not once had this issue. I think this is a bad design choice of Riot. I have made an image to demonstrate the issue. I hope there is room for a bit more blank space around the lock in button.