Q:

AC calculations in the D&D 5e German Starter Set

I'm just getting into D&D and I'm having trouble understanding the calculations of the ac right. 
On the predefined character sheets in the Starter Set, each character has his "starting" AC value printed on it - I understand this as the AC calculated by the stats and Equipment each character has at the start of the game. 
For some this calculations work fine, but for some I don't understand how I'm supposed to get to the right value:
Human Fighter: 17 AC

Chain Shirt (13)
9 Dexterty (-1)
Trait "Defensive Fighting Style" (+1 AC while wearing any armor)

My calculations: 13 - 1 + 1 = 13 (wrong)
Half Elf Fighter: 14 AC

Leather (11)
16 Dexterty (3)

My calculations: 11 + 3 = 14 (right)
Drow Rogue: 14 AC

Leather (11)
16 Dexterty (3)

My Calculations: 11 + 3 = 14 (right)
Dwarf Cleric: 18 AC

Chain Shirt (13)
8 Dexterty (-1)
Shield (+2)

My calculations: 13 -1 + 2 = 14 (wrong)
Mage: 12 AC

No armor (10)
15 Dexterty (2)

My Calculations: 10 + 2 = 12 (right)

I am clearly missing a Point.  I've read through the Starter Set multiple times, but I can't figure out what I am missing! 

A:

The German translation of the Starter Set confuses Chain Shirt with Chain Mail, which is the armor actually used by the Human Fighter and Dwarf Cleric in the Starter Set.  Chain Mail is a heavy armor providing 16 AC, Chain Shirt is a medium armor providing 13 + dexterity modifier (up to 2) AC.