Runes of Magic US / AU

i am noticing the ancient memento drop has changed today. I used to get 6-7 for first area (battle for misty grove), always 8 on the ancient ruins, 2-5 at sley farms. Now i am recieving 4 for the misty grove, six for the ancient ruins, and same for third area depending on what my score is. Why?

yes i agree that a couple of times some other players have came in when fighting boss at last minute and i recieved 50% reduced rewards and there are other times when i go into an area and see that X amount of mobs have been killed and still get full rewards. But what I am saying is that the times when no mobs have been killed before starting event and no one else in area has been present I am seeing reduced rewards.

some people in world chat are calling standard event rewards loot 1 rune. The outcome for any event or quest should be fixed or based on score.

apparently the computer isn't giving extra credit for killing the main boss in each area event. Normal scores are based on a 10 point per npc kill and the main boss generally giving around 100. so if your score is 650 and you kill the main area event npc at finish you get 8 mementos but i am not getting credit for defeating the area event npc. Granted each event is different the slew farms and misty grove are simple elites but the event in bymorsh gardens has a major world boss which should and normally does reward you for that as does the other events.