People, there is a difference between Element Property Attack + to Additional Element Property Attack +.
The first one doens’t give you an additional “Damage Tick”. It’s just applied to a “Damage Tick”, and is converted to the element that particular “Tick Damage”, despite it “sounds like” it only adds damage to that particular element. It’s pretty much like the bonus damage from blessing. It will be added both to your auto attack and to the subsequent “Damage Ticks”. It will also be applied to every tick of skill damages.
The second one gives you a “Damage Tick” to your auto attacks, they won’t be applied to skill damage.
I’m really intrigued with the fact that the first one (Element Property Attack +) works with ANY kind of element damage (despite the description says like it adds only to that specific element). I don’t know if it’s intended or if it’s a bug they still haven’t solved.