a strange number in the footer

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Hi folks, I have a problem in the footer. A number appeared and I don’t know where it came from.
The number is located right under

<div id=”fb-root”></div>

script.
Refer to this screenshot: [https://i.snipboard.io/qaoYcH.jpg](https://i.snipboard.io/qaoYcH.jpg).

And I find the number in the widget panel control: [https://ibb.co/8bncscY](https://ibb.co/8bncscY)

The link is [ercolina.it](https://ercolina.it)

Thanks for your help

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