I have only received one splinter on my priest. Happened to a guild mate as well. All other characters were able to get two splinters and turn them into a spark.
Have you done anything else besides the weekly quest on your priest? You can only get one splinter from the weeklies; the other must be obtained through catch-up means (raid bosses, dungeon bosses/M+ completions).
I did the weekly quest for one splinter and the PVP quests for the second, but they did not reward the second splinter. All other characters received the second splinter. Also none of the other characters had that strange red text saying that I had already received the weekly spark.
same thing just happened to me
This sounds like the actual bug, as the weeklies are only supposed to award one per week, full stop. That’s why I mentioned that the other must be obtained through catch-up means (which Blizzard officially clarified in a post yesterday).
ahhh makes sense. So the bug was getting them and now it’s fixed.