How do I get rid of "red" areas on map landscape?

Hello,

On my landscape there are areas that are tinted red. This isn’t in my texture at all because it is also effecting my buildings. For my buildings it was a bright red color. I then ALT-Dragged the piece and it mostly went away on the new piece and I deleted the old. For the landscape, it appears even when I take my texture off of the landscape. There doesn’t seem to be any consistency as it is on the low and high parts of the landscape. It is the same with lighting on and off.

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This just happened again.