FILE PHOTO: The Instagram application is displayed on a phone screen August 3, 2017. REUTERS / Thomas White / File Photo
The error led to a small test being distributed a lot, the company said. As part of the test, some users had to tap and swipe their feed horizontally to see new posts, similar to the Stories feature.
The instant change triggered a widespread rebellion among users on Twitter, with more compared to Snapcat's unpopular redesign.
"The Instagram update is so rubbish it is worse than the Snapchat update," @samfloresxo tweeted.
The newly developed Snapchat app has struggled to attract more users since the rollout last year, and recent versions have been criticized for being too confusing.
In response to a tweet, the manager of Instagram asked Adam Mosseri about the confusion and said, "It should be a very small test that went wide accidentally."
"We quickly solved the problem and the feed is back to normal," Instagram said in an email message.
Reporting of Subrat Patnaik in Bengaluru; Editing by Arun Koyyur