Silent Cave boss not giving completion

Hi, i just killed the boss in The Silent Cave unique map, and for some reason i did'nt get any points, and the map is flagged as being failed.
Not a big concern but idk that's pretty stupid since the boss is so hard to kill while corrupting every essences. ( might be the problem tho, i corrupted every single ones and the boss too )
I tried getting out and coming in again, nothing changed, also tried to look every corner and found nothing.

it has nothing to do with number of corruptions or monsters killed, i just killed the boss without any other monsters because i was there mostly for atlas points, can't complete the map