It’s not immediately clear what the trailing value is for (0/3) is for. For the daily Una’s task images below, it is interpreted as “finish 3 Una’s tasks, earned up to 3 times” which indeed earn 15 Ark Pass experience per completion. However, while the completion count looks fine the trailing counter seems to be stuck in all instances. Looks like a visual bug.
EDIT: seems it’s really slow to update?
Now it’s completely messed up, having reverted back to 0/3.
Also note the completion of Challenge Guardian raids - if you can only do all three of them total of once per week, how the heck are we supposed to do it 3 times?
(All screenshots from Hotpotgg on NAE Una)