Game deleting tons of water

I've made a clay producing room, on the bottom I put a layer of 1t of water filled tiles and a layer of a few grams of water so the polluted water bottles keep offgassing. On the bottom layer i put doors just in case i wanted to stop offgassing manually, however I don't use it. Picture below.

After running it for several tens of cycles I noticed the thin water layer is completely gone. I tried opening and closing the doors, however it seemed it had no impact whatsoever. The bottles kept offgassing slowly anyways so I just shrug my shoulders and decided to deal with it later. Now I came back to it and realised there's not only the thin layer missing, there's actually tons of water just gone, one whole tile even got completely deleted and somehow replaced by 3kg of CO2, which IMO shouldn't even be there, since my dupes can access it only in atmo suits and barely enter the room, just to restock the filtration medium. The oxygen pressure in the room is about 5kg. It ran flawlessly while it was closed and the pressure was well above 200kg. Picture of the liquid overlay below.