When Water meter in Field Climate shows Values in other units than you selected then please check the rain gauge cable.
In this case the unit for Water meter was selected as 1dL (green square) but the chart also shows Water meter 1l (yellow square) and only one sensor is connected.

The rain gauge cable is located on PCB on RAIN (yellow square below). 

The colours of the cable can vary.

Check, if the two cables in the middle are okay or have any defect. Often the cables, the Plug or the copper strands on the socket are oxidated.  

If there is anything damaged change this part or write a ticket.