The map likely geolocated you somewhere without buildings (or maybe in the ocean) and where it is the middle of the night (so everything is in shadow).

Try this link which shows the shadows at the Space Needle in Seattle WA today at 5pm:

https://shademap.app/@47.61991,-122.34913,15.43536z,17865792...

Or look at the shadows of the Alps at sunrise:

https://shademap.app/@45.46158,6.45036,7.47555z,178633748245...