moving a transform by 10 but it goes exra...

this has me totaly stumped.

im telling my camera to move down 10 like so:

 function initCam()
 {
     cam.transform.position.y = -10;
 }

and for some reason when i test the app it goes from 0(its starting Y position) to -11.10805. i cant imagine why it would blatantly ignore what i have written in the script.

here is how its called:

 function OnGUI () 
 {
     if(totalTargets == 1)
     {
         if (GUI.Button(Rect(Screen.width*.1, Screen.height*.45, Screen.width*.15, Screen.height*.05), "Initialize"))
         {
             initCam();
             for(t in TargetedTargets)
             {
                 if (t == true)
                 {
                     targets[c].initNow();
                 }
                 c++;
             }
             c=0;
         }
     }
 }

side note: when i try to put it back to 0 using cam.transform.position.y = 0; it goes to -1.108051 instead. so far this is the first piece of code for moving the camera in this project. so it cant be any interference from any other scripts.

• forgot my unity was out of date, could be some kind of error. i'm going to update and restart my PC or something, see if that fixes it.