@alkaladi54
Not at all, 100 mm is far too low ! This layer shows the Rain accumulation up to 10 days and tropical areas can receive 1m =1000 mm of rain and more during a week.
See some examples
https://community.windy.com/topic/10039/status-barr-amount-of-rain
https://community.windy.com/topic/14204/axis-units-error/2?_=1615532649442
And see at the moment the 10 days forecast on West coast of India or in Southeast Asia.
So it is NOT a bug !