Shadows Fade Out

Hello,

Here is a video of the problem:

As you can see, the shadow fades out as I approach it, and I can’t change how strong the transition is or how to stop it completely.

I have seen all the other questions here, but I really think I haven’t seen anything like this.

It’s as if there is a distance where the shadows change, but I have adjusted every setting to test it out, and nothing affected it.