Index S2 - Sum of Metrics is Higher than Total Weight

Hi

I am using the new Garmin Index S2 scale and am so far happy with it to monitor my progress. However, I seem to get something wrong. When I calculate the % metrics into Kg and then sum up all the metrics (body fat, muscle mass, bone mass, water) then the result is way over my total weight.

Here is an example:

Weight 83.9 kg

Body Fat 28% -> 23.49 kg

Muscle 33 kg

Bone 4.4 kg

Water 52.6% -> 44.13 kg

SUM: 105.02 kg

What am I getting wrong here?

Thanks