Wrong rune gets swapped

Why hasn't this been fixed yet? If you set up a rune page and then click a secondary rune to replace, it doesn't change the secondary rune you clicked on, but the other one. It's like the system just alternates every time. Makes me pick the wrong runes when I'm trying to set runes before a match and don't catch it in time. There's no reason the rune I click on shouldn't be the rune that gets changed.