Power query does not upload all records

Yes, the issue isn't on Power Query, it's that the API structure if updated must have placed a limit of records to return in a call. You would need to check the documentation to validate that and see if you can modify the parameter or if it has a threshold (usually if it isn't specified the API takes the default value of the items to return which may or may not be its threshold). If it indeed has a threshold you need to adjust your solution with functions and parameters to address the API pagination.