Parsley form:error firing multiple times

Hello,
I am using this plugin since 2015. This is an awesome plugin. Recently after updating the plugin to 1.5.0.6, I am having some issues with form validation. Previously, jQuery was used for form validation however, now Parsley is used for form validation. I have updated all the form validation functions accordingly.
The only issue I have now is that parsley’s form:error handle is called multiple times.
To be more specific, I have list of courses(https://studyselect.local/university-courses/) on this page. A form loads when the enquire online button is clicked. I am sending stats to Google analytics every time there is a form validation error. Its working fine when I load a form for first time. However, when I close the form and open another one, the event is fired 2 times and it adds up every time I open a new form.
I am using:

 window.Parsley.on('form:error', function() {
  //my code here
});

Please let me know if you need more information.

Thank you,
BD