This is the 13587th most frequent Turkish word.
kulübelerin
"The small huts' or 'the cabins'" (possessive form, plural).
Here, 'kulübelerin' is in the genitive plural form, indicating ownership or association (of the huts).
Kulübelerin çatısını tamir etmek gerekiyor.
The roofs of the sheds need to be repaired.
The word 'kulübelerin' is incorrectly used here if the intended meaning is possessive plural. It would be better as 'kulübeler'.
Ormanda pek çok kulübelerin olduğu söyleniyor.
It is said that there are many sheds in the forest.
In this case, 'kulübelerin' again shows association, specifying a location around the huts.