According to the company, the bug "caused a small number of people's Instagram Stories trays to show accounts they don't follow." The full Stories did not load if the accounts were private. Instagram says it corrected the issue in a matter of hours and believes only a small percentage of accounts were impacted. But as TechCrunch points out, 500 million people use Instagram Stories daily, so even a small hiccup like this, could have a far-reaching impact.
Instagram's full statement is below:
"We're aware of an issue that caused a small number of people's Instagram Stories trays to show accounts they don't follow. If your account is private, your Stories were not seen by people who don't follow you. This was caused by a bug that we have resolved."