You should refer to the PI Ping Interface user manual as this plugin has the purpose of facilitating PI Points creation. It is an optional tool since you can create the same PI Points manually. There should be a copy of the manual on the PI Data Archive server under the folder C:\Program Files (x86)\PIPC\Interfaces\PING.
Please read on the manual about the Location2 and Location3. If they are misconfigured, you won’t receive the expected values.
It is a good practice to compare if you are receiving the same values when using the ping tool from Windows.
Hope my suggestions help you!