Relating the co-ordinates in bounds in JSON output with actual location in PDF

The text Find object locations is at 181px from left in the PDF, however, the JSON output from the PDF Extract API returns this: 

{
      "Bounds": [
        108.02000427246094,
        692.2299957275391,
        246.02609252929688,
        708.1900024414062
      ],
      "ClipBounds": [
        108.02000427246094,
        692.2299957275391,
        246.02609252929688,
        708.1900024414062
      ]
}

From what I understand, 108 is bottom left location of text.

However, as per the PDF it is 180px.

Can you help understand the relation here?

Note: Input PDF has been attached.

Thanks!