Source: HD2 Discord
We are performing an update to our backend logic that will change the way "impact" is dealt. Impact is the "liberation" that players deal to enemy planets or defend events. It used to be that Helldivers needed to complete an operation (usually 3 missions) in order for impact to be distributed.
Now, each mission will deal impact, and completing an operation will then deal bonus impact. This is primarily done to make sure that everyone performing missions can safely say that they have contributed to keeping the galaxy safe, without the need to have the operation complete.
Hopefully this will make the system easier to understand, and the casual diver who only has time for a mission a day can still effectively help the war effort.
Didn't they claim that this was impossible to do when there was back to back server issues for months after launch, and players were begging for their progress to count for SOMETHING