Liquid flow logic f̵l̵o̵w̵e̵d̵ flawed

How much liquid on the left tile ? It look like a natural air compressor some of us are using to overpressurize geyser water with metal doors, but here it should propagate to the left

I have played on from there, but as I remember when investigating, the remaining water pressure there was around 1300-1400 kg/tile.

Later I found another tile of water in the same lake where pressure rose to 40,000 kg per tile.