offset param

Dear devs,
I'm writing concerning param **offset**, in documentation was written: _Use offset instead of page and limit parameters. It is much more flexible for the client, e.g._.
For example i've tried to search by category: GET _/offers?offset=0&limit=5&country.code=PL&category.id=2_
And when i want to extract next part of collection
GET _/offers?offset=**5**&limit=5&country.code=PL&category.id=2_
i've got the same result and any changes in param _offset_ working same way, everytime i've got the same result with same enteties.

My question is: what it colud be and why i am not able to extract next part of collection (I've already has registred REST API and have all necessary key