Lioness075

I have the same issue on my MacBook Pro 2017 model. Never had the issue with water until I went underground into Delver's Row and then the Old City Ruins. I'm hoping it'll go away when I leave the area. My best guess is that it's specific to this area, though I have no idea why. Below are two screenshots I took while in the ruins. The glitch is occurring in the map, too.