It arguably is a bit strange. According to the manual, the "foggy" QD weather uses the "AP Fog Variable 1" weather pattern. And the AP Fog Variable 1 weather pattern is not one of these patterns where it is stated that it cannot be used at night. So if the fog indeed does not work at night in QD, the manual is indeed not clear on this front.
I did just hear back from AP regarding the 1700 issues discussed earlier - he stated that they do not recognise that issue and invited us to provide more details. I don't normally do QDs so perhaps @Kim_olesen1 you want to do so? Ideally you should use UK routes for this purpose as non-UK routes are not officially supported as far as the Time of Day files are concerned.