Whats the actual request you are making?
If the user is offline then they will not be shown in the output
The Streams API only returns a Stream for users that are online. Offline users gets nothing in the response
So what you are seeing is correct. Offline users are not returned in the group of 100 when you specify 100.
So if you request 100 user_logins and only 50 of those are live, then you’ll only get 50 streams
I have called the API with three users_logins and I got the expected response