Shadows on floor of second level from walls of first level

Hi, sorry for posting on an older thread. I hope you got this figured out already. If not, and for future readers, I found a workaround .

Those shadows are issues with the platform walls on the first level. As a workaround to hide the shadows, raise the platform on the second level. Another way is to try using taller half walls on the lower platform instead of full walls. 

In my build i have a basement with medium walls and platforms 3 ticks high. However no matter how high or low, the floor above the largest basement room has a lighting glitch matching the perimeter of the walls. 

I suppose the weird glitches add to my haunted movie theater but its not my ideal choice.

I have the same problem except walls in the basement are making shadows of their shape that show through to the first floor. I tried to hide it with darker tile but even it shows through even the blackest tile in the game, the black bathroom Grounded Tile pattern. 

greetings !

I have the problem with basement walls which create a shadow-like line on the first floor.            It's visually unattractive and it annouys me in the long run.