Cooling energy consumption is way higher than heating consumption for mild climate

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I am simulating a virtual building which is representative of a large office (7000 m^2) in Ireland. I am using standard office occupancy, equipment gains, lighting gains, set-points and IdealAirLoads. Windows to wall ratio is 0.35 (standard Irish office).

Cooling energy consumption is 10 times higher than heating energy consumption (attached). What could be the reason? If I remove internal gains (attached) I heating and cooling consumption are in order, but I have set office internal gains based upon office standard guidelines in W/m^2.

Any suggestion?

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