This form is the only form that has these errors, i have other forms using the same repository that work fine, some of the other forms also use "Retrieve Laserfiche forms content" to start the workflow and all of these work fine.

  I did see the other questions on here, but as i already have current forms that work it does seem that the issue is the form itself that has the issue. 

$(document).ready(function () {
  
  $.getScript('http://server/Forms/js/moment.js');
  
  $('.cf-table-block').on('blur', 'input', sumtotal);
  $(document).on('click', '.form-del-field', sumtotal);
  
  function sumtotal() {
    var hour = 0;
    var rate = 0;
    var total = 0;
    var subtotal = 0;   
    $('.cf-table-block tbody tr').each(function () {
      hour = moment($(this).find('.hour input').val(), 'HHmm');
      rate = moment($(this).find('.rate input').val(), 'HHmm');
      subtotal = hour.diff(rate, 'hours', true);
      $(this).find('.total input').val(subtotal.toFixed(2));
      total += subtotal;
    });  
    $('.Grandtotal input').val(total.toFixed(2));       
  }
  
  function parseNumber(n) { 
    var f = parseFloat(n); //Convert to float number. 
  	return isNaN(f) ? 0 : f; //treat invalid input as 0; 
  } 

});
 

I found the soloution, I removed the reference to the external "moment.js" ($.getScript - line) and put the moment.js in the forms js folder and now its works fine.