Stuck on night time

Ok, the problem is apparently tied to the specific flight you’ve chosen (it may be locked to the conditions for that flight), or possibly the online choices. I’d try just an ordinary free flight and see what you get. I’ve attached a screenshot of what the weather/time dropdown should look like if you weren’t tied to specific conditions. The time selection is near the top of the screen just under the cloud cover selected. Hope that makes sense.
Regards