https://www.fflogs.com/reports/Z7JKqTGcjNmgwrMn#fight=8
It looks like all of their casts are doubled. The encounter was 9:42. Dragonfire Dive is on a 120 second cooldown, so a max of 4.85 casts. Blood for blood is an 80 second cooldown, so they would have gotten 7.27 casts of blood for blood. On their parse, they did 8 casts of Dragonfire, and 12 blood for blood. There isn’t an astrologian, so no spear.
The deaths are also doubled.
If you compare the total casts of these two parses:
https://www.fflogs.com/reports/Z7JKqTGcjNmgwrMn#fight=8&type=damage-done&source=7
https://www.fflogs.com/reports/k7m9FARdLwzaZNhC#fight=5&type=damage-done&source=4
It should actually be impossible to cast double in just two more minutes.
Could this be affecting their total damage output?