According to the Verge, users of popular Instagram for Windows Phone app 'Instance' are seeing their photos deleted soon after they are uploaded to Instagram. Instance developer Daniel Gary confirmed to the Verge that Instagram seemed to be "detecting when photos are not uploading via the official app" and removing them. Instagram has since told the Verge that the issue is down to a change in the Instagram API.
If it were an API issue then the photos wouldn't upload to begin with. And APIs generally don't break apps unless they deprecate something really old. If Instagram is going to behave like Apple they need to come up with better excuses.
People use instance as windows doesn't have instagram.So windows user use instance.This is some what equal to Instagram and allows video sharing .And windows user can use instagram through instance, its like third party use Now
Instagram has deleted photos which especially affected 3rd party users.