Leak sensor behave like door sensor

I have

  1. Wyze home security hub connect internet work well with motion sensor
  2. Just received 3 leak sensors, but neither sensor body nor with probe detect any water event(I put either one into a cup of water)
  3. since probe end to sensor body is with magnet, every time I connect and disconnect probe, sensor body LED blink and app show leak event
  4. I use magnet to close to senor probe contact on sensor body, it trigger leak event, it more like door sensor to me
  5. my leak sensor firmware is 0.0.0.11/2.6.0.42
  6. my hub firmware is 4.32.13.685/2.5.0.87