Weird Shadow in the corner

[puzzlezaddict]

@Lusilsantos  I do think I see what you mean, the darker coloring towards the bottom of the screen.  I've circled it in red:

My point is, if you look closely, you can see the boundaries of the active lot, even in the sand in the upper left corner.  I've put green lines just outside them.  The coloring of the water on the active lot is different than outside it.  This doesn't look great, and it may or may not respond to adjusting your graphics settings.  But it's normal to see effects like this.