"Better Cities .esp" has to be activated and not merged. Activate it and make sure there is a check mark in the box instead of a + and rebuild your patch making sure you uncheck it when it asks if you want to merge it. That should fix it.
Edit: Also uninstall Let the People Drink and any patches there may be for it that have a LetThePeopleDrink.esp master. It has been integrated into Better Cities.
Update to the edit from my last post: Yep well disabling the Grass Overhaul ESP has fixed every problem I had with terrain tearing/seams and a couple floating roads.
So to the OP, don't bother with the load order/patch I mentioned, just disable the ESP from Grass Overhaul and it should be fixed.