possibly not a bug, but I have near to 0 experience with this, so I'd welcome an explanation please

8
Uraxor uses [Ritual of Binding]
9
The essence of the charms are fusing together to form a new effect!
Uraxor uses [Preparation]
78
Uraxor uses [Ritual of Binding]
79
The essence of the charms are fusing together to form a new effect!
Uraxor uses [Preparation]
86
Uraxor uses [Ritual of Binding]
87
The essence of the charms are fusing together to form a new effect!
Uraxor uses [Concentration]
Caldera of Flame.
How come I got Preparation twice? missed the combo because of it =(
http://wl.attrib.org/estiah/replay/9dca79c