Social Users cant reply or post

Hi,
when an user put name & email he can post a comment or reply. But if the user wants to login with Facebook, when he returns to my blog site he cant do it. The message box and reply buttons dissapear.
I checked the inspector of the navigator and it shows me an error:

jquery.min.js:2 Uncaught Error: Syntax error, unrecognized expression: #=_
at Function.se.error (jquery.min.js:2)

Link to a demo post -> https://www.coquetosalicante.com/la-importancia-de-la-higiene-bucal/
Can you help me to solve it?

Thank you!

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