This is what the config browser says about CfgChainOfCommand >> Sizes >> Section:

commanderRank = "";
name = "Fireteam";
nameGender = "0";
nameShort = "FT";
size = 2;
textDefault = "%1 %3";
textShortDefault = "%1 %3";
texture = "group_2";

name should be "Section", not "Fireteam";