Twisted Wounds Mutator Bugged?

[Kiln Malac]

So I was playing around with the Merciless and the Mutator Twisted Wounds and noticed that the mutator's damage was acting really low. Normally when you increase the duration of a negative status, it does more damage over time resulting in a larger total damage number on the character screen when looking at your weapon. This means my twisted wounds should be doing 2760 damage over 40s and Merciless does 3450 damage over 40s. What's odd is that the damage procs for Twisted Wounds are dealing 6 damage while merciless are dealing 33. This did not make sense, so I did some investigating and if I take off the Time Keeper's Jewel ring (increase duration of status effects) Merciless still does 33 damage, but twisted wounds now deals 12 damage a proc. I think this means there's some kind of bug with how Twisted Wounds Mutator is functioning with duration increasing effects, as opposed to how other status are supposed to be affected? Instead of doing the same damage, it's doing less damage to spread the damage over the same amount of time? Even though the UI says the increased duration increases the total damage.

Does anyone know if this is intentional and simply a UI issue (without the ring it says Twisted wound should be doing LESS damage, but it's doing more damage per tick).