http://www.newsweek.com/instagram-algorithm-feed-not-chronological-order-april-fools-delayed-1385438

Instagram users scrolling through their feeds Wednesday were surprised, and even annoyed, that they kept seeing April Fool’s posts from two days prior.

Users were tweeting about the fact that the algorithm on Instagram was showing them posts on their feeds out of order and in some cases from days prior. Instagram says that it’s normal for users to see posts that might be a few days old.