Walking Calamity decreases rage instead of increasing it

Since I unlocked Walking Calamity I used it together with the skill rampage. Now I can't. I mean I can't do anything with Walking Calamity apart from basic attacks.

And that happens because instead of adding 5 rage per second while active, it actually decreases 5 per second while active. Please fix this as soon as possible because I made my build around it and it's not fair to all of a sudden having it unplayable.

thanks

Update:

I found the issue - the support Gem "Rageforged II" is counting the "Support skills spend 10 rage to deal 30% more damage" in every meteor that falls.