There were two things that were unclear originally:
1. The time of collision was originally thought to be nearly an hour later than it actually was, but it has been determined that the USS Fitzgerald actually reported it an hour later than it really happened, due to damage to the communications center on the Fitzgerald, and they were probably too busy containing flooding, fire, and damage to make that their top priority (I assume that, don't know) 2. When people saw the tracking data of the ACX Crystal, the times were off on that as well due to a misinterpretation of the local time.
These have both been taken into account, and the collision occurs at point B in the graphic below, not at point A. After the time of collision and the local time adjustment were made, the collision is very likely point B.
Additionally, look at the dots signifying speed of the ACX Crystal. 
As Freeper TXnMA hypothesizes (and, I think correctly) it appears the two vessels may have been traveling on parallel tracks and either the ACX Crystal overtook the USS Fitzgerald and struck a blow to her starboard side, or the Fitgerald got in the path of the ACX Crystal and was struck a glancing blow. Either way that makes more sense to me, as a 30,000 ton container ship traveling at 20 knots would cut right through even a stout naval vessel if hit dead on to the side (T-bone).
After the collision, the crew of the ACX Crystal may have been awoken, checked out damage, then doubled back to see if they could render assistance.
They may not even have known what kind of vessel they collided with, the fate of the vessel, or even it it was a vessel. For all they knew, it could have been a whale, a floating container that fell off a ship...if there was even one person awake on watch on the ACX Crystal, I can easily see pandemonium and confusion. The watch could have been surfing the internet or reading a book, and been just as confused. And we still don't know what transpired on the bridge of the USS Fitzgerald.
We won't know until we see the track of the USS Fitzgerald, but the adjusted times make more sense.