I'm a human with max dexterity and charisma. Before taking the swashbuckler edge I fought the Scarab outer until it died, counted the attacks that weren't parried, and then checked how many I dodged. Then I took the edge and repeated the same fight under the same conditions. In both fights there were about 100 attacks that weren't parried and both times I dodged about 50% of them.

Is it possible swashbuckler got broken somehow? Or is there something special about that mob that made it not have any effect?