https://techcrunch.com/2019/04/11/instagram-stories-bug/

Today in “Facebook apps are too big to manage”, a glitch caused some users’ Instagram Stories trays to show Stories from people they don’t follow.

TechCrunch first received word of the problem from Twitter user InternetRyan who was confused about seeing strangers in his Stories Tray and tagged me in to investigate. The screenshots below show people in his Stories tray who he doesn’t follow, as proven by the active Follow buttons on their profiles. TechCrunch inquired about the issue, and 22 hours later Instagram confirmed that a bug was responsible and it had been fixed.