User blog comment:Dragonjet/KC3改/@comment-49.145.84.221-20150903103057/@comment-26091666-20150904111906

This is not a bug, it is because KCV and KC3 Kai cannot talk to each other, much the same if you were using any other viewers or playing the game and clearing the quests without using a viewer at all.

KC3 Kai keeps track of quests roughly via when the quests indicate that either 50% or 80% is done.

However it maybe able to track more accurately when you sortie on certain maps where it requires a completion of a specific requirement.

Kancolle game does not tell the client/viewer anything about specific quests that are either active, complete or even has any records of the progress other than a simple percentage indicator explicitly stating the rough progress.