Newbie trying to modify CSV and convert to FIT

I use a Renpho scale to get my weight and other physical data onto my mobile phone Renpho app; I hand copy 8 of the 12 or so metrics from the data into an app called "Weight Logger" and this generates a FIT file which imports OK to Garmin Connect.

I then used the SDK (with Java) and a simple batch file to convert this FIT file to a CSV & then back to FIT with a different name, and this imports to Garmin Connect too, so the process is working fine.  However, I would like to add the other metrics to the CSV file, convert to FIT and import ALL data to Garmin Connect, but so far without success.

I've attached two CSV files called "working,csv" and "failed.csv"; where the failed I've added some BMI data (columns AE,AF, AG) and changed one cell (E3) from 9 to 10 as I thought this may be the number of data?

Any help to sort out where I'm going wrong would be very much appreciated.  :-) 

Not sure if the 2 files uploaded?  I dragged them into the window??