Weird ailment values indicators (goes positive and negative, shows multiple shocks)

The ailment indicators have a strange behaviour and I'm having a hard time understanding whether or not I'm applying my ailments properly or not.

Why are there two shock indicators? The last one is the cumulated effect of up to 50 stacks, but what's the first one? And why are all three ailment types dipping into positive or negative values randomly?

I tried changing some gems and unspeccing some passives but I can't find the source of this weird behaviour. Ballistas alone aren't the cause, at least. I don't know if this is only visual or if the values are actually reversed - am I negatively scorching enemies?

Build details:

- Storm Rain + Ballista Totem Support + GMP + Elemental Proliferation (stacks hoarfrost and shocks mainly)
- Snipe + Added Fire Damage Support + Pierce + Culling Strike (used for scorch and on-kill effects)
- Manaforged Arrows + Rain of Arrows + Hextouch + Temporal Chains (longer ailments)
- Oath of Summer + Oath of Winter + Oath of Spring
- Painseeker for bigger ailments, Blackgleam for conversion, the rest is normal rare gear, with a phys and lightning bow
- Auras are Hatred, Precision, Clarity, plus Herald of Ash

Same post but with a video, on reddit

im having this same issue, with negative values but not multiple same indicators