The first parse is with 1 less alacrity augment than the 2nd. My connection is stable and I sit at 15 ms. The second one was just above the alacrity threshold to reach 1.3 seconds on the gcd while the first one was slightly below. I've tried this for multiple classes (lightning sorc and marksman sniper) and found very similar results. I've also tried the same thing but with the threshold to reach 1.4 seconds and found the exact same thing for all of those specs. I've also had someone else test the same things and they've found similar results. The abilities that are cast/channeled that are longer than 1 gcd seem to round to the nearest .01 second which is unnoticeable but abilities that are instant or are exactly 1 gcd always act like it's rounding up.
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That moment when the link to the patch notes is almost longer than the actual patch notes