Cursor alignment issue between monitors

I am having an issue with the alignment of the mouse pointer between different computers

I have 3 computers set up each with 2 monitors  (3 wide x 2 high)

Each computer has the primary monitor on the bottom and the secondary monitor directly above.

The computer layout in multiplicity is three computers on the horizontal plane

  X   X   X

I will use the following layout and monitor numbers to describe the issue.  

2   4   6

1   3   5

computer 1 is monitor 1 and 2

computer 2 is monitor 3 and 4

computer 3 is monitor 5 and 6

The first 2 computers (4 monitors) work fine

the 3rd computer has issues with mouse alignment.

When moving the mouse across from monitor 3 to 5 the mouse ends up in the bottom left corner of monitor 5

When moving the mouse from the middle of monitor 6 to 4 the mouse ends up in the middle of monitor 3 

When moving from mouse from the middle of monitor 5 to monitor 3 the mouse ends up at the bottom of monitor 3

 All monitors are identical and are all set to the same resolution.