Discretize Build Has More Health

My friend was following a power virtuoso build on discretize, which says the vitality should be 1478 and health around 20.7k. my friend has all the gear exactly like the build, but only has 1000 vit and about 16k health.

I noticed the "assumed buffs" which has the most potions, but according to calculation on wiki, that only adds 243 vit.

I can't figure out where the extra 235 vit comes from. Can anyone help?