If your tweets aren't posting at all, please read this article.
Tweets are repeating, deleting, or otherwise behaving unexpectedly
1. Delete the feed and then add it back
2. Revoke access to Twibble from your Twitter Account Settings: Log into Twitter and go to your Account Settings by clicking your Twitter user photo in the top-right corner. Then, from the left navigation menu, click Apps. Find Twibble in the list of apps on the right, and click Revoke Access.