Viper Strike & Chaos Damage Nodes / Keystones

I thought Viper Strike had a chaos damage aspect with the dot as well as on hit chaos damage.

However it doesn't scale up when you put points into chaos damage points (i.e - method to madness)

Tooltip damage doesnt adjust with the addition to points being spent.

So is there no direct way to scale VS chaos damage with passives?
Or is it just bugged?

The tooltip DPS in no way reflects the DoT. It shows the damage for the main hit only.

nevermind my game was bugged relogged & its showing