Unfortunately, the response of the inventory endpoint is not always 50 items at each page.
If you can, you can ask for a new page till the response is empty.
We work hard to resolve the issue.
The issue is resolved
The amount of items in the response could be lower than before 24-08-2020, this is because we do not give inactive offers in the response.
In the response we only give offer with FBB or items that have stock.