The fog is only seen at certain times of the day

You will not (sorry, missed the NOT first time) be surprised to hear that a bright light is seen at a greater distance in fog than is an unlit object. I think the problem is that sometimes the lights carry much too far a night. An unlit runway is fine at night it is just that the surroundings can be unusually well lit.

Perhaps the minimum visibility is too much? Minimum visibility selected.

Dusk

Night. Unlit objects are not excessively visible.

The runway's side view.

There is a phenomenon where a runway can be visible from a low fly past but once the approach is made the runway disappears in the long oblique view through low mist which gives lower visibility than the direct view from above during a fly over. Making surroundings better lit than the runway might simulate this but is there too much distant light when visibility is set at the minimum?

The minimum cumulus cloud base is at something like 1,200 feet so clouds will not feature in most Aerofly runways. They always seem to be very scattered clouds too so even landing on a high elevation runway with the menu sliders at 'low' cloud height and 'high' cloud cover we get quite a small probability of an obscured runway.

In the (link since deleted!) YouTube video the 12 bars of the runway markers are first visible at the radar altitude of 70 feet, the orange numbers at the bottom of the artificial horizon. That corresponds to the Runway Visual Range or Visibility which is how far away an unlit (not an actual light) but contrasting from the background object can be seen in poor visibility. The runway approach lights were seen much earlier, seven sets of lights (an instrument approach visual standard) were already visible by the much further out radar altitude of 220 feet.

The visibility in the video is probably more than 100 metres, the lowest visibility in Aerofly was about 550 metres last time I tried to estimate it.

Why delete your video link? Here it is.