Ability and item set tooltips showing strange values on low level characters

Merlight

I noticed some weird numbers on various set items in guild bank when inspecting with sub-50 characters. Unless otherwise noted, the following samples are CP160 items viewed by level 3 character. Most of the items were blue quality; green and purple quality items show identical values.

Bahraha's Curse
(4 items) Reduces your damage taken from environmental traps by 23% (instead of 40%).

Syvarra's Scales
(4 items) Reduces your damage taken from Guards by 11% (instead of 20%).

Leki's Focus (CP160 and Lv40 items show same values)
(5 items) Reduces your damage taken from area of effect abilities by 14% (instead of 25%), but the damage and healing of your own area of effect abilities is also reduced by 25%.
(Yes, the second number actually stays at 25%. As if the set wasn't terrible as is. )

Shield of the Valiant
(4 items) Reduces your damage taken from Players by 2% (instead of 5%).

Morag Tong
(5 items) When you deal direct damage, you cause the enemy to take 5% (instead of 10%) more damage from all Poison damage abilities for 5 seconds.

Light of Cyrodiil
(5 items) While you are casting or channeling an ability, your damage taken is reduced by 8% (instead of 15%). ...

Bastion of the Heartland
(4 items) Reduces your damage taken from Players by 2% (instead of 5%).
(5 items) Reduces your damage taken from Siege Weapons and Player area of effect abilities by 11% (instead of 20%).

Buffer of the Swift
(5 items) Reduce damage taken from Players by 5% (instead of 10%).

Beckoning Steel
(5 items) Generate an aura that causes you and 11 group members within the aura to take 5% (instead of 10%) less damage from projectiles. ...

Dreugh King Slayer (old BoE CP140 item)
(5 items) Gain Major Brutality at all times, increasing your Weapon Damage by 27% (instead of 20%). When you kill an enemy, you gain Major Expedition for 8 seconds, increasing your Movement Speed by 30%.

Steadfast Hero
(5 items) When you cleanse a negative effect from yourself or an ally, gain Major Protection for 5 seconds, reducing your damage taken by 17% (instead of 30%). ...


I also checked with a level 36 character. With that character most of the above values were correct, but others were wrong. For instance Cyrodiil's Ward showed Major Defile 34% (instead of 30%) and Fasalla's Guile showed Minor Defile 17% (instead of 15%).

Merlight

Original topic title was "Some item set bonuses show strange values on low level characters", but I've since noticed similar issue with ability tooltips.

Sorceress level 3
Surge (not unlocked): ... Major Brutality, increasing your Spell Damage by 27% ...
Entropy (not unlocked): ... Major Sorcery, increasing your Spell Damage by 27% ...
Circle of Protection (not unlocked): ... Minor Protection and Minor Endurance, reducing your damage taken by 4% and increasing your Stamina Recovery by 10%.
War Horn (not unlocked): ... increasing you and your allies' Max Magicka and Stamina by 13% ...
Continuous Attack (not learned): Increases your Weapon and Spell Damage by 5% and Magicka and Stamina Recovery by 13% ...
Siege Shield (not learned): ... reduces damage from siege weapons by 29%.

Nightblade level 36
Drain Power (not unlocked): ... Major Sorcery, increasing your Spell Damage by 23% ...
Momentum (not unlocked): ... Major Brutality, increasing your Weapon Damage by 23% ...
Hidden Blade (not unlocked): ... Major Brutality, increasing your Weapon Damage by 23% ...
Lethal Arrow (rank III): ... Minor Defile, which reduces their healing received and Health Recovery by 17% ...
Entropy (not learned): ... Major Sorcery, increasing your Spell Damage by 23% ...
War Horn (not learned): ... increasing you and your allies' Max Magicka and Stamina by 11% ...
Continuous Attack (not learned): Increases your Weapon and Spell Damage by 5% and Magicka and Stamina Recovery by 11% ...