I just made a Leviathan blade after having an ascended calibur sitting in my arsenal at level 10 for months, and then proceeded to take it to FSC for heat. I couldn't help but notice that, even against gun puppies, it doesn't seem to do the 3-hit spin in the charge anymore.
Was the 3-hit thing a bug in the first place that got fixed, or is it a bug now that's stopping it from maximum damage output? Right now it's doing about 50 more damage per charged hit than my WHB is doing per hit during the regular combo.
Calibur line charge does hit 3 times. I believe it is a swipe>spin>spin. So you have to face the enemy you are attacking.
If that still doesn't work, it's a bug.