internal gains increase when using Template:Zone:IdealLoadsAirSystem

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Hello! I run two simulations on the same model: first without the ideal Loads air system and one with it. when I look at the results of the first simulation run in the HTML the sensible heat gain by the occupants is 0.452GJ when I run it with the ideal Loads air system it is 4.987GJ. can sombody explain me why the internal loads increase so much? I thought the gains by occupans should be indifferent from the object: Template:Zone:IdealLoadsAirSystem

Thank you in advance!