Here's the issue: Extra Turning is technically not a feat that can be taken by any class (AllClassesCanUse = 0). It is listed as a potential feat for Paladins, meaning that you can select it when leveling up as a Paladin. It is not listed as a potential feat for Favored Souls (no turning-based feats are). I expect that you are trying to take the feat on a Favored Soul level. Now, all this is very silly. Other turning feats can be selected on any level as long as you meet the requirements--Empower Turning, for example, and even Extra Turning 2!. If you'd like to change this, you need to override feat.2da and change AllClassesCanUse to 1 on line 13 (ExtTurn). Or you can just console the feat in, as you've done. Still, that's a cheat to get around the legitimate issue (though of course you're entitled to do whatever you'd like in your own game!).