weird watermark like rectangle object in background.

I noticed this in my town after a long while of not ever nukeing town. Then I nuked town started over and it was gone.

Am I going crazy are is this a bug that happens if you’re town gets too big. Because if I nuke again and it goes away then it’s def a legit bug. And it’s annoying. I think it’s def something they need to look into. It will be near middle of screen and it is visible. Not horrendously noticeable but it’s still annoying.