It appears to be missing extended bolus information!?
$ cat examples/Insulin-use-and-carbs.csv | cut -d',' -f 3,4,5,6,7,9 | grep -E "Volume|unknown" | head
Bolus Type,Bolus Volume (U),Immediate Volume (U),Extended Volume (U),Duration (min),Notes
Combination,0.900,,,60,Combination unknown
Combination,0.550,,,30,Combination unknown
Combination,1.500,,,30,Combination unknown
Combination,1.500,,,30,Combination unknown
Combination,0.350,,,30,Combination unknown