Horrible Attack Move Bug

I have found what appears to be a bug that hurts my ingame performance. Earlier I made some adjustments to the Attack Move Click bindings with Attack Move On Cursor on. After a moment I set it back to normal. What happened after that was the Attack Move functionality behaving in a way that isn't right.

When I use Attack Move Click on a target that is within my champion's attack range, I do Attack Move On Cursor as normal. When I use Attack Move Click on a target that is outside my champion's attack range, I end up attacking the nearest target to me as if I don't have Attack Move On Cursor enabled.

This is worrying because this issue is guaranteed to hurt my ingame performance. I have ticked and unticked the Attack Move On Cursor box and accepted the changes multiple times which does nothing, I have deleting the Config file after making changes ingame numerous times, and have uninstalled the game once to find that this issue still exists despite all of my settings being reverted to their base values.

I have noticed that this issue has been reported a few times on the forums but never has been responded to, as well. This is a serious issue and I would appreciate anything.