It seems as of tuesday that the bug with aimed shot has been reintroduced. For those not in the know, a bug was fixed in 10.0.7 that was causing aimed shot to deal significantly less damage than it should when someone switches specs to survival and then back to marksmanship. I am currently recreating this on the pvp target dummy and in skirmishes where my aimed shots are hitting for approximately half of the tooltip value in the absence of defensive cooldowns or other things that would cause it to be lower.
Here is video content that someone posted to reddit showcasing the bug, note that his aimed shots are hitting for 55-60k on the dummy with a tooltip listing it over 100k. https://www.reddit.com/r/worldofpvp/comments/14ymikr/mm_aimed_shot_bug_help/