Creating Ignition Report from FT Vantage Point - Values Differ

I am trying to replicate a report in Ignition that is currently being created on FactoryTalk Vantage Point.

Unfortunately the values I am getting are different even though the tag, interval rate, aggregation mode and time stamps appear to be the same.

If anyone has any suggestions on why these values may vary would be greatly appreciated.

The Ignition data source and example results are as follows...


image

The FT Vantage Point data source and example results are as follows...
image
test

For example, in Ignition is shows 190.0667 under cA but should show 189.6 as it does in the second row of the FT image.