Shadows with future lighting becoming "triangles"

For some reason shadows with future lighting start having a heart attack when i try doing some labyrinth or stuff like that with them,is it normal?

If its not,is there any way to fix that?
Im sorry if im posting it in the wrong category

You could try to turn off "Cat Shadows for your walls, or just change illumination radius

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Future lighting is a feature I recommend not using since of the performance issues, even at graphics level 3.

I think the shadows are normal and there’s no issues.