Ok, so I have a char who, according to my math, is getting a +2 AC bonus out of nowhere in all 3 scenarios (dual wield, shield, and single weapon w/o shield). This goes away when I rest, but comes back when I re-log.
Details: (DM and QC eyes only)
Teifling (indicates stat without bonuses from gear)
Str 28 (25), Dex 20 (18), Con 14 (11), Int 16, Wis 8, Cha 6
Ranger 11 (hunter kit 10)/ Cavestalker 6 / Assassin 8 / Tempest 5
AC - related feats:
Luck of Heroes ( +1)
Armor Skin ( +1)
Protective Ward ( +1)
Hide of Stone (from Cavestalker, +2 at cs lvl 6)
Tempest Defense (from Tempest, +2 when dual wielding)
Shield Specialization: Heavy (+1 when heavy shield equipped)
My AC math:
Base: 10
Gear Mithral plate +4 (5/5): 14
Other gear +4 (Deflection, Natural, Dodge): 12
Tumble 30: 3
Luck of Heroes: 1
Armor Skin: 1
Protective Ward: 1
Hide of Stone: 2
10 + 14 + 12 + 3 + 1 + 1 + 1 + 2 = 44
Dual Wield adds 2 from Tempest Defense = 44 + 2 = 46
Shield Spec Heavy and heavy shield +4 = 44 + 7 = 51
Instead, I get 46 normally, 48 when I dual wield, and 53 with a shield. As I mentioned, this goes away when I rest but comes back when I relog
Oh, and I went to Ograhns wielding a single weapon and no shield, which should have given me an AC of 44, to test to see if the 46 on my char sheet was inaccurate. It wasn't inaccurate. I have a screenshot of a drow missing me on a roll of 45.
I see at login a message that says "Acquired a new feat: Cavestalker". The "Cavestalker" feat description on my char sheet just says "cavestalker". No other info. The wiki doesn't mention it. If the "Cavestalker" feat is supposed to grant an ac bonus for being in the underdark, it should not have gone away when I rested in Mist Lake and S'Shamath, but it did. It also should have gone away when I was standing in the middle of BG market, but it did not.
I suspect that the problem must be either that Hide of Stone is being applied twice at log in, or there is some sort of problem with the ranger optional feat "Protective Ward". Protective Ward and Cavestalker class are the only two ac-altering features I haven't used before.
I've also discussed this in-game with QC guru Eastern Cheese.
ETA: Same thing in Eastern Farmlands. Bonus goes away when I rest, comes back when I relog. So it must not be a conditional thing related to being in the underdark. Some sort of ac bonus is being applied twice at login and then applied correctly on rest?