In DDQ, in the past, when you got the 250 HP reward, it was on a 2-tier cover (darkish blue). Now it was rated 3 stars and comes on gold cover.
The 1k iso reward from one of the nodes also comes as 3-star, thus on gold cover.
But on Magneto/Iso8 brotherhood event, the last node in each lab gives a 1500 ISO reward, but is rated as a 2-star reward.
This is probably a bug, so here is the report
But what is the logic behind this? 250 HP is hardly a 3-star reward, considering a 3-star cover costs 1250 HP. Same goes for the 1000 HP reward, rated as 4-star… You cant buy a 3-star cover with it. I understand HP is worth more then a cover, as you can buy the cover you want, not being hostage to chance, but still… 250 HP should be a 2-star and 1000 HP a 3-star, with drop rates adjusted acordingly.