Running Flightradar24 in browser on my home computer the day/night line appears correct.

However at the same time the day/night line on iOS (both iPhone and iPad) is not correct. It is off by at least an hour.

Is there a way to correct this issue locally or is it an internal (server) issue?

Additionally, on desktop (browser) there are five day/night regions. I assume this is for day, night, astronomical, nautical and civil twilight. On iOS there are only three regions. I assume day, night and a twilight. Is this normal behavior as well? If so, which twilight is the grey region on iOS?