Thanks to the bugs there is in regard to Collections. A lot of people has lost a lot of Collections. If you have a set that is not completed, then it might have been reset, so there 0 completed in that set. Have Collections like that from RoF to EoK. Example, Collection in SW, missed scorched rune, now I miss all in that Collection.
Confirmed this also on my account and several other players confirmed on Tunare. Specifically, for me, collection sets in EoK that were incomplete, but had some items collected, are now empty. Any complete collection sets still show as complete.
Some re-assurance here. I didnt check this myself but a friend told me its just a display bug. You can tell this because if you have already collected an item and you get another and mouse over it it will say you already collected it and it will not let you click it again. edit: again, I did not check this myself but it sounds right.
Collections should be back to their original partially complete state as required. Sorry for the inconvenience.