This is a variation on the english idiom "When it rains, it pours."
When it rains, it pours: When one thing goes wrong, many other things also go wrong.
Last week my dog ran away, and my computer crashed and my girlfriend broke up with me! When it rains, it pours!
here's how another website put it....
(it never) rains but it pours/when it rains it pours
- problems often appear together in large numbers or quickly one after the other
It is true that it never rains but it pours and our winter was spent dealing with problem after problem caused by the new accounting system.
" When it rains, it pours "
Adage Meaning - Misfortunes seldom come alone
Hope this helps!
Student or Learner