Bloody Storm and weird crits

So, I was at ToT today, at Memory guardians. I usually use FABSUS, and today was no exception. I was FABSUSing and BSing through mobs. I leveled up during 2x on Saturday, and had put 3 points into Sharpness.

That gave me a 16% crit rate (yes, I know my range isn't very good).

And so, when I was BSing, I noticed that my crits were being... odd. Sometimes (actually, quite often), they would look like this:


I was just like "what?"
Sharpness doesn't show any reason it should do that, and I can only get it to happen (that I can prove) with BS. TS only does 1 attack, 2 with MI, BF doesn't do it, US only does 2 attacks with MI, and I can't see FA's damage most of the time.
I'm trying to get more pictures, but my scroll lock key is (fn)f9, so that makes it hard to get SS's fast and without dying.
Does anyone know why this is doing it?

That has to do with the random number generator. There's been multiple threads about this in the far past (can't blame you for not noticing). Bottom line: don't worry about it.

i recommend frapsfor quick screenshots.

and i dunno either what cahses it, same with the 1st and 4th hit of several moves, and pally's blast.

Yeah, it also sometimes does it for the 2nd and 4th hit of BS.
Haven't noticed a pattern for any other skills.
It's rather nice, however. Does a lot of damage.
EDIT: Does it for FA and SS, too.