I've often found myself unable to trigger my abilities even though this indicator pops up and I thought it was ping related at first. While that may be the case in some situations I did some testing myself and found that the indicator doesn't match the targetting range from above or below, as...
It's a non-issue. You were willing to concede and then you moved the goal posts. Just disable sticky keys like every other being on this planet who encounters it the first time after a fresh windows install. It has absolutely nothing to do with the game.