
Since the 2016 One Tamriel set overhaul, there have been only 14 set items added to the game where the item's weight did not match the weight of the associated set... and of those 14 items...
- 1 was added in Summerset
- 13 were added in Blackwood
I'm guessing whoever did the itemization this patch is new and didn't get the memo about how all this is supposed to work.