Long wire Water Tank Level Indicator, Floating Values when on Electrical outlet

somehow I have managed to create full wiring, this is the fist time i am creating such wiring I am not very good in it, if something is not cleat please let me know.

before posting this wiring diagram I have again tested it in breadboard and result are below.

For testing, I submerge +VCC wire in a glass of water then submerge other 4 sensor wires one by one and it shows HIGH values correctly for each pin and values are stable every time, but when i connect the 30 meter long wire in similar way i got HIGH for the 1st level but then it start fluctuating for 2-3 seconds and then freeze at LOW. Putting other 3 sensor wire in glass of water have either dose not show any effect or it just fluctuate form high to low and unstable.

I am not sure if changing the arrangement of CAT5 pairs will have any effect because i have tried different random combination but results were same.