I recently uploaded 360 images where I later descovered they missed the proper EXIF tags to be “official 360” images. But Mapillary did detect them as 360 images.
I can’t speak for Mapillary naturally, but I think this part of your EXIF/image data may clarify things:
The width is exactly double of the height. That is a tell tale property of a 360 image. And I think there are rarely “normal” images with that aspect ratio (2:1). So maybe Mapillary assumes a 360 image solely on that aspect ratio?