So iv gotten this strange water physics bug.
Water seems to cling to the walls were it should be dropping.
This isnt exactly game breaking but it gets drawn to the side sometimes when dupes pass through it.
It also seems to have a strange effect that some resource on the far side of this anti-grav water seem to come in and out of play.
In the picture you can seem the places where the water has been hooked into.
Also i know about the watermark xD
Make water pour down walls. Mine occurs from an ice biome.