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Why is there an extremely large space cooling value at the start day of my equest model?

I have been trying to simulate a building which contains mechanical ventilation and air conditioning. The result looks reasonable to me except when I check the peak daily profile. Usually, the peak day occurs on weekday since all light, equipment and occupancy will be at its peak load. However, when I check the peak daily profile, I found that the profile in January differed from expectation.

https://ibb.co/nr7K4hw (see my result here, thx~) At the start of the year, the space cooling went peak at the start hour then dropped back to normal. Has anyone ever come across the same problem? How can I fix it?