“Due to a bug, some users saw a change to the way their feed appears today,” Instagram said. Stories can be advanced by tapping or swiping, a user experience similar to the change briefly put in place on Thursday. Tapping through Stories forces users to also tap through advertisements. When ads appear in feeds, though, Instagram users can simply scroll past them. But the update forced users to tap or swipe past each photo in gallery-style ad posts in order to move on.

Source: New York Times December 27, 2018 16:41 UTC