TextField 2 pixel offset

Hello

I try to get Textfiled coords, with follow code(in coordinate system of textField itself)

textField.getBounds(textField)

and I found, that we get 2 pixel offset in target coordinate system

"bounds": {
      "topLeft": {
        "y": -2
        "x": -2,
       "length": 2.8284271247461903
      }, 
      "right": 127.44999999999999, 
      "bottomRight": {
        "y": 36.1, 
        "x": 127.44999999999999, 
        "length": 132.4640045446309
      },  

As you can see x=-2, y=-2, but i expect that x will be 0, and y will be 0.

In other case we get much bigger offset on x axis:

"bounds": {
      "topLeft": {
        "y": -2, 
        "x": 31.65, 
        "length": 31.71312819637949
      }, 
      "right": 195.65, 
      "bottomRight": {
        "y": 49, 
        "x": 195.65, 
        "length": 201.69264364373828
      },

}

Anybody can explain this behavior of TextField