So I had Hallowfall (am already maxed several times over) near 5800 then pushed it over the 7500 with the weekly world quest rep and headed to Mereldar as usual to go get the bag.
No yellow question mark, no reward but now my bar is back down to 750/7500. Couldnt find much on google but in game was told this is to be expected in the new patch no more max level renown rewards. Working as intended?