This is because their powers come from the Far Realm, and this connection is closely related to their mental state. To avoid accidents, psychological health assessments for mediums have long been part of the standard procedure.
The problem is that Zhang Hong is now the de facto head of the Tianhai City Supernatural Department. She's the boss. At least during her leave, no one will know about the issues she's facing.
But such matters cannot be kept secret. Given her current condition, she simply can't work normally, and sooner or later others will notice.
...In fact, Zhu Kangwen knows why Zhang Hong subconsciously chooses to procrastinate, even though it's evasive, it constitutes dereliction of duty, and is tantamount to gambling with her life and the lives of others. Even if all is well, she can't avoid punishment afterward.