Site Diary hours worked can currently only be viewed as a lump sum number per employer per day.
Site Sign In hours is a calculated field that calculates the difference between the sign in time and the sign out time, and this can be viewed per worker, and also summed up to be able to be viewed per employer.
The Site Diary hours and the Site Sign In hours will not be aligned in Insights.
There are differences between these due to the fact worker sign in times can be manually added or adjusted within Site Diary, meaning additional entries can be created, and existing entries can be modified.