It doesn't seem to be in their tracker. Mapillary had a similar problem, it turns out that the camera API was updated to provide the orientation sensor orientation and they were using the older API on a phone with a rotated sensor.

https://github.com/openstreetview

https://fadlotech.blogspot.de/2015/11/the-reason-why-nexus-5...

https://github.com/mapillary/mapillary_issues/issues/1929