Temporal Chains scaling debuff icon mismatch

Each player that joins the zone scales down temporal chains I understand that but if only 1 other person joins the Debuff icon on monsters shows much higher slow percentage than what it actually slows down. I slow down white mobs about 50% or so its displayed under their health bar with 1 other player in party but in reality is about like 30%. I think maybe all player curse power is firstly calculated and applied as debuff which shows 50% on the icon but then there is player count penalty applied afterwards