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Marlo_Stanfield, By the way, did you fix your mouse? If not, you can try
this as a temporary solution; it might work. Of course, this is only if you have a problem with the extra click.
Recently, I had the same issue with my mouse. A typical example is when you place a wall of fire, and the unit immediately runs into it and dies due to an instant extra click. And I'm saying all this because recently, it turned out that the wall was placed directly
on top of an enemy unit! I went into the spellbook (not using a hotkey), selected the wall, and, apparently, the mouse glitched when I hovered over it, and that's what happened. I haven't been able to reproduce it since. Has anyone else experienced something similar?