heat gains through glazing more than losses in design builder
the window are distributed uniformly on each side of the single family house 4 on each side
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"Passive" design often looks to achieve the kind of positive heat balance you describe, and you could easily envisage a family house in Graz overheating in summer under some circumstances. 1ach suggests you may be simply scheduling ventilation, but if analysing overheating you should use calculated natvent (airflow network). The beauty of simulation is the ability to test different options, so you should consider different glazing distributions, properties, shading, thermal mass and issues such as schedules and internal gains that affect the overall heat balance. See the free DesignBuilder tutorials if you're new to the software.
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Can you be more specific? What exactly the problem? If the heat gains are greater than the losses, you should see either a) the gains offset by a cooling system, or b) a rise in zone temperature. If you are not seeing one of those two responses, then there may be an energy balance problem.
Where is the building located? In many climate zones that are cooling dominated the heat gains will be more then the losses due to the solar gain.
The climate is in Austria,Graz. And yes the building is over heating even though we have natural ventilation of 1ach in summer