X50 ultra is moping without water

Hi there, my X50 Ultra is not using water while mopping.. I got it 3 months ago, the problem started after 3-4 weeks.

I turn on the option "mop after vacuum" with the max suction power + max amount of water. I observe the robot often since i noticed the problem and I see that most of the time the robot is mopping the floor without using water! Even the mop pads are completely dry after the task! :(

1. Isn't the app supposed to notify me that the robot does not have water?
2. Why doesn't the robot just go back to the station to get water?
3. Isn't the robot supposed to have some water in it when it's starting a task? The mop pads should at least be wet :/