Posting BUG- 50 Posts per minute

Revive Old Tweet, in one of my client’s sites spitted about 50 posts per minute, but others didn’t. What could’ve have happened? It got a lot of her 80K followers MAD. Please advise.

Thanks

JA

https://ww.wp.xz.cn/plugins/tweet-old-post/
http://www.screencast.com/t/y2NC5nV8yp