Here is the combat log, I am, in fact taking more damage with the orbs on. We did the same test, same conditions, just after I healed up we put the orbs on the second time. One critical in each, just took more tick damage (367 to 385) and more initial projectile damage (373 to 403). Quite the issue.
Combat log
09:16:24:839 [Combat] Semz took 373 damage from Zäch
09:16:24:839 [Combat] You are now in combat.
09:16:25:861 [Combat] Semz took 367 damage from Zäch
09:16:26:872 [Combat] Semz took 367 damage from Zäch
09:16:27:906 [Combat] Semz took 367 damage from Zäch
09:16:29:939 [Combat] Semz took 367 damage from Zäch
09:16:31:006 [Combat] Semz took 367 damage from Zäch
09:16:31:984 [Combat] Semz took 367 damage from Zäch
09:16:33:006 [Combat] Semz took 367 damage from Zäch
09:16:34:029 [Combat] Semz took 367 damage from Zäch
09:16:35:051 [Combat] Semz took 561 damage from Zäch (Critical)
09:16:36:072 [Combat] Semz took 367 damage from Zäch
09:16:37:151 [Combat] Semz took 367 damage from Zäch
09:16:43:059 [Combat] Semz took -6928 damage from Semz
09:16:46:185 [Combat] Semz took -7455 damage from Semz
09:16:49:251 [Combat] Semz took -13419 damage from Semz
09:16:52:363 [Combat] Semz took -14164 damage from Semz
09:16:55:363 [Combat] Semz took -13419 damage from Semz
09:16:58:485 [Combat] Semz took -22365 damage from Semz (Critical)
09:17:00:374 [Combat] Semz took -42494 damage from Semz
09:17:00:729 [Combat] Semz took -127482 damage from Semz (Critical)
09:17:26:408 [Combat] Semz took 403 damage from Zäch
09:17:27:263 [Combat] Semz took 385 damage from Zäch
09:17:27:464 [Combat] Semz took 385 damage from Zäch
09:17:28:497 [Combat] Semz took 385 damage from Zäch
09:17:29:508 [Combat] Semz took 589 damage from Zäch (Critical)
09:17:30:520 [Combat] Semz took 385 damage from Zäch
09:17:31:541 [Combat] Semz took 385 damage from Zäch
09:17:32:617 [Combat] Semz took 385 damage from Zäch
09:17:33:629 [Combat] Semz took 385 damage from Zäch
09:17:34:697 [Combat] Semz took 385 damage from Zäch
09:17:36:686 [Combat] Semz took 385 damage from Zäch
09:17:37:763 [Combat] Semz took 385 damage from Zäch
09:17:49:419 [Loot] Entered PvP Safe Zone