Ceiling and Bottom Tilt seem to be reversed

[BastiJoe]

Hello together
I am running the 'BuildingThermal1Zone1D' example.
The used walls, ceiling, bottom are connected to the Zone at Surface Port 1 and to ambience at surface port 2.
When looking at the Q_flow at heat port 2 I see, that during summer months, the heat flow of the bottom is greater than for the ceiling.
Is there maybe a reverse of these two in the parametrization of the Tilt angle?

Am I missing something here?

Thank you very much in advance.

Best reagrds
Sebastian