Error in dropdown connected with Post Categories

I’ve been trying since yesterday to link the categories to the drop-down menu to populate the category of the posted post. I noticed that in the javascript console on the page where the form is present to have the following error:
SyntaxError: Invalid escape in identifier: 'Publications \'
in correspondence with the signaled line there is the following code portion:

<script type = 'text / javascript' id = 'post-my-contact-form-7-load-js-extra'>
     / * <! [CDATA [* /
     var cf7_2_post_6c13c6bd47 = {"radio_715": "\" <optgroup label = \\ "Publications \\"> <option class = \\ "\\" value = \\ "65 \\"> Jurisprudence <\\ / option> <option class = \\ "\\" value = \\ "66 \\"> Materials <\\ / option> <option class = \\ "\\" value = \\ "67 \\"> Essays <\ \ / option> <\\ / optgroup> <option class = \\ "\\" value = \\ "1 \\"> Uncategorized <\\ / option> \ ""};
     / *]]> * /
     </script>

How can I solve the problem ?

I’m running 5.4.6 version

The page I need help with: [log in to see the link]