Submit button is getting disabled without using toggleDisabled module

[dipak4github]

Submit button is getting disabled initially even though i haven't included the toggleDisabled module. Please help

var _config = { lang : 'fr', form: '#orderForm', modules : 'security', validateOnBlur : false, / disable validation when input looses focus/ scrollToTopOnError : false, // Set this property to true if you have a long form

    onSuccess: function() {   
        let is_product_selected = _is_Quantity_Selected();  
        if(!is_product_selected){

            $('<p class="text-danger">* Atleast selectionner un produit avant de passer la commande.</p>').insertAfter('#order-heading'); 
            $('html, body').animate({
                scrollTop:0
            },'slow');  
            return false;
        }
        //console.log('valid'); 
    }, 
    onError: function($form) {
        if($('#orderForm .has-error').length > 0){
            var position = $('.has-error').offsetTop;
            $('html, body').animate({
                scrollTop:(position)
            },500);  
        }  
    },

    onElementValidate : function(valid, $el, $form, errorMess) {
        //console.log('validating'+valid); 
    }     
}; 
$.validate(_config);