These audience dimensions can cause Google Analytics to filter rows because of privacy reasons:
Read more about the Data Thresholds here: https://support.google.com/analytics/answer/2799357#thresholds
Mobile Device dimensions
Choosing any of the dimensions below might lead to unexpected total values, as they will not include data for desktop users. This is the same behaviour as in Google Analytics' UI and has to do with the fact that data is only returned for rows where these dimensions have values.
- Mobile Device Model
- Mobile Device Branding
- Mobile Device Marketing Name
- Mobile Device Info