Edit: This isn't a real issue it's just user error!
Using Nexus 5x. Mapillary version=389(3.89)
I posted my phone in the right window of my car. When in automatic capture mode and the car slows down and stops the camera takes a burst of images (sometimes nearly 20!) usually in the same spot. Each of these images have semi-random directions. After the car starts moving again the images are fine.
EDITED: The actual issue is caused by the timer based capture enabled instead of distance based capture.