Your result from the duo test was conclusive after the 28 day window, so you have 2 conclusive results. There was no reason to test the third time, so you don't have to test again. It is a time to be happy now.
There is no reason to be concerned about differences in the two results. The only thing that matters is you are conclusively negative so you are free to move on to happier things in your life.
Thank Everyone. I will forget it and move on.
Different index values are specific to different time of the day, technology used for testing and body temperature. They dont mean any thing as long as they are non reactive.