alignment

I have the following Approval being set for a 3 page document and the alignment is considerably off. What is the unit of measurement for the top/left/width/height values? I am receiving these values from a vendor so it may be something with what they are sending. Is there any other setting that would skew the position of the signature?

{
	"role": "a1546000000xtaqAAA",
	"id": "a1546000000xtaqAAA",
	"fields": [
		{
			"top": 222.62,
			"left": 72,
			"subtype": "FULLNAME",
			"width": 252,
			"page": 2,
			"type": "SIGNATURE",
			"height": 36
		}
	]
}

Thank you, Rich