We recently discovered a bug in our Account Activity API (AAAPI). This API allows registered developers to build tools to better support businesses and their communications with customers on Twitter. If you interacted with an account or business on Twitter that relied on a developer using the AAAPI to provide their services, the bug may have caused some of these interactions to be unintentionally sent to another registered developer.

https://help.twitter.com/en/account-activity-api