The Rophs is right as far as I remember.
Regardless of how much ve creats have at end of fight, log will always say that they regened X amount related to regen stat. In other words log will always say how much they maximally could regen with their regen stat if they needed it. That's in layman's terms. However I believe that those creats still do regen that amount even if they all at full ve, but then when fight is completely ended script cuts extra ve away to make creat have max ve and not over.
It might even save a bit of personal ve (untested) because as far as I noticed if you use your personal ve in fights with combo and you lose less ve than your combo amount, it will result in your personal ve being untouched because this combo magic ve takes priority in being dished out. So it's all about how that ve cleanup works at the end and it's quite messy, take for example personal ve at start and your lifestealers yet you suffer quite a lot of damage during fight but your lifesteal recovers you and then you still won't lose personal ve because game makes no distinction of which ve is which (or from where), it only compares starting values to ending ones.
Also I don't see anything wrong with your -840 and your blue highlight, all is in order.