InfoPath Dev

I have create an InfoPath form that uses the Userprofileservice.asmx web service to retrieve the information form the AD. I have used a .UDCX file store the data connection. My environment is SharePoint 2013 with InfoPath 2013. I wanted to view the First Name, Last Name and Preferred Name on in some text boxes. So I have used the below filters

First Name - Value[Name = "FirstName"]
Last Name - Value[Name = "LastName"]
Preferred Name - Value[Name = "PreferredName"]

The XPaths are as below.

First Name - xdXDocument:GetDOM("GetUserProfileByName 2")/dfs:myFields/dfs:dataFields/tns:GetUserProfileByNameResponse/tns:GetUserProfileByNameResult/tns:PropertyData/tns:Values/tns:ValueData/tns:Value[../../../tns:Name = "FirstName"]

Last Name - xdXDocument:GetDOM("GetUserProfileByName 2")/dfs:myFields/dfs:dataFields/tns:GetUserProfileByNameResponse/tns:GetUserProfileByNameResult/tns:PropertyData/tns:Values/tns:ValueData/tns:Value[../../../tns:Name = "LastName"]

Preferred Name - xdXDocument:GetDOM("GetUserProfileByName 2")/dfs:myFields/dfs:dataFields/tns:GetUserProfileByNameResponse/tns:GetUserProfileByNameResult/tns:PropertyData/tns:Values/tns:ValueData/tns:Value[../../../tns:Name = "PreferredName"]

This SharePoint site uses Claims based authentication.

But when I published the form to SharePoint I get

First Name - SPPrdAdmin
Last name - EMPTY
Preferred Name - SPPrdAdmin

I cannot understand what I have done wrong.
Please could someone help on this? Thanks and regards, Chiranthaka

Are you populating a username first via a field labeled something like User with a default value of userName()?

Yep. I am populating a field labeled like User with a default value of UserName(). Also I am the Site Collection Administrator. But I cannot access the 'Central Administration' section of the SharePoint Site. I don't have permission to access it.