Instagram says a bug is to blame for a big change that was accidentally leaked Thursday morning.
The social media site apparently tested changes to the way users view their feeds.
Normally, users scroll down vertically through posts. But for a short time Thursday, some users had to swipe and tap through their feed.
The unexpected change quickly trended on Twitter with users voicing their displeasure.
Instagram says the goal was to test the new “tap to advance” feed in a small group.
It has since returned the feed to the normal settings.