Why are my shadows working when the screen is maximized but not when it is not?

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:bust_in_silhouette: Asked By Artifabrian

So I am trying to learn 3D using the “Your first 3D game” page on the Godot docs, and my shadows from a DirectionalLight3D node are acting very strangely. When I am not in Fullscreen (Even if you just resize the window to Fullscreen), the shadow from my character is very boxy and missing some parts. Thank you!

(Even if you do not know the answer, feel free to give me suggestions, because I am stumped.)
If you want to view pictures of the differences, open this link: question - Google Präsentationen