Infinite loop with Facebook Messenger


I’m doing a very simple scenario where I answer messages on my Facebook page, when the message doesn’t have an @ it goes through the first node, there it greets and asks them to send their email, in the router if it has @ it goes through the second route, I use gpt to separate the email from the message they send, and then I answer, at the end everything is uploaded to a google sheet, the problem is that when I turn it on it starts sending messages like crazy without stopping, in a carelessness it made more than 2000 operations on sent messages.

Does anyone know why this happens or how I could stop this loop?

Thanks