This can occur because (as mentioned before) hits are reported during firing
regardless of whether they actually hit (and sometimes a "miss" can actually hit and cause damage, too) so it can be confusing to read the log for details and try to match them up precisely to everything that's happening.
I'm not worried about this in particular, because it still needs to be determined if and how the log should be redone. I recently moved that much closer to the top of the list, so we'll see..