Feats That Do Not Stack?

[Lokeal_The_Flame]

For critical hit damage, I've chosen every enhancement for slashing weapons that I had an option for, I am a pure artificer.... are there any feats that do not stack in pure class builds?

[janave]

feats that you can take multiple times, like *toughness* should stack, if they dont, it is best to be bug reported.

[LordKalkin]

For critical hit damage, I've chosen every enhancement for slashing weapons that I had an option for, I am a pure artificer.... are there any feats that do not stack in pure class builds?
Why slashing instead of piercing?

[unbongwah]

For critical hit damage, I've chosen every enhancement for slashing weapons that I had an option for, I am a pure artificer.... are there any feats that do not stack in pure class builds?
Feats should stack with everything. [EDIT: except for Improved Crit feats, which don't stack with Keen / Impact weapon property.] If you find something which doesn't, bug-report it.

Why slashing instead of piercing?
I'm inferring the OP went melee arty and took the hand-and-a-half enhancements, which are for b.swords & d.axes, hence slashing.