testfor command radius affecting 4 blocks instead of 1 block

Hello, so I have a repeating command block with a chain command block beside it and I have set the coordinates to a specific coordinate using this command in the repeating command block /testfor @p[x=X,y=Y,z=Z,r=1] but it tests in the specific XYZ, and also 3 other blocks around it.

In the images attached, it should only be testing for the coordinates on the green wool but as you can see I am diagonally on the opposite block of the green wool but it still detects that I am there.