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PHILADELPHIA (CBS) — Instagram is apologizing after social media erupted over what was through to be a new update.

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On Thursday, many users had to tap or swipe horizontally through their Instagram feed, versus vertically. It was like how users scroll through the Instagram story feature.

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However, Instagram head Adam Mosseri said the update was a test that went broad by accident.

“That was supposed to be a very small test that went broad by accident. Should be fixed now. If you’re still seeing it simply restart the app,” said Mosseri on Twitter.

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Many users took to Twitter to vent their feelings.