Strange one. Battery under load variance

[Popeye]

Hi all.

I made a couple of changes to my discharge curve profile for the battery bar earlier, unplugged the mod and the battery was sagging further than usual under load.

Using the same dripper and same build, it went from sagging by 0.1 to 0.2v to 0.8v at the same wattage settings.

When i plugged it back in and did a hard and soft reset it went back down to normal levels. Nothing else had changed.

Im just curious as to what could actually cause it really.