Customer Board API is not providing the next records. Always returning the same set of entries in the API Response

I am trying to get the customers from Rose Rocket using Customer board api.

If I provide limit as 2 and offset as 0 in the Request Body, I am getting two customer entries as response. Ex: Cust-1, Cust-2
If I provide limit as 2 and offset as 2 Request Body, I am again getting the same two customer entries as response. Ex: Cust-1, Cust-2
The expected behavior should be getting another different customer entries. Ex: Cust-3, Cust-4; But in this case, we are getting same set of entries.

Please suggest.

First Request:

Second Request: