So I am just working on a chair in blender and opened it up and I immediately ran into this problem.
I would select a corner of a cube and move it into a position, done with it, and then go to select the next corner, which should automatically deselect the previous corner and only select the current corner, except Blender just isn't cooperating today and selecting both corners as if I was holding down shift to select them both. I have obviously pressed a button or something which makes it do this but I couldn't find anything when I searched it up so I need your guy's help. Thanks guys.
Nothing selected here
Box select first corner
Box select second corner, not holding down shift