So this reset I went at got my Voidcores like normal and then did a Mythic Dreamrift killed it after some tries and different groups, then used 1 Voidcore to get bonus loot, then went at did some M+ and didn’t get the reroll window so when i checked it said i had no Voidcores left but i have only used 1 core this week so it seems the bonus roll on Dreamrift used 2 voidcores
made a ticket to a GM and they said I should come here to make a bug report