Why are my averages not coming out correct?

Sample sheet attached. Basically, I want to know why averaging my averages is not coming to the correct number. I have a data set that calculates an average. I am then averaging the averages of that data. Each row on the sheet holds the same weight of the total. I then turn around and add up the total data and average that to get the average of the averages, and the number is different. I have set the decimal places all the same.