Rogues reducing armor by 19% instead of 15%

[Ravager]

Aimed Shot with this upgrade should reduce armor by 15% and not by 19%. I tested in both CTF and TDM.

My armor jumped down from 2434 to 1970.
When my armor was 2336 = 1891

That's 19% instead of 15%.

This is bad for a few reasons.
It has contributed to the imbalance of the game, especially in pve.
Possibly part of the reasons mages get 1 hit ko / 1 combo'd so easily.
Possibly contributing to why jug gets broken by random rogues.
Rogues using 20% armor reduction pets only to find out, if the pet's chance to reduce the armor of the opponent finally does happen, its only 1% more.

Update: This was rogue vs war. Rogue vs rogue seems to yield 15% on the aimed shot which is normal. Have not tested rogue vs mage.

Update 2: Tested mage and rogue. When tested with one player, it was 19% armor reduction. With another player, it was 17% armor reduction.

Update 3: Found the possible issue. Aimed shot or any armor reduction possibly overriding the Durability passive. Durability is useless in pvp:/