Hello,
Here is the solution:
Campaign Backend: /wp-content/plugins/wp-crowdfunding/includes/woocommerce/class-wpneo-crowdfunding.php
Line#452-465
// _nf_funding_goal
$_nf_funding_goal = intval( sanitize_text_field($_POST['_nf_funding_goal']) );
wpneo_crowdfunding_update_post_meta_text($post_id, '_nf_funding_goal', $_nf_funding_goal);
// wpneo_funding_minimum_price
$wpneo_funding_minimum_price = intval( sanitize_text_field($_POST['wpneo_funding_minimum_price']) );
wpneo_crowdfunding_update_post_meta_text($post_id, 'wpneo_funding_minimum_price', $wpneo_funding_minimum_price);
// wpneo_funding_maximum_price
$wpneo_funding_maximum_price = intval( sanitize_text_field($_POST['wpneo_funding_maximum_price']) );
wpneo_crowdfunding_update_post_meta_text($post_id, 'wpneo_funding_maximum_price', $wpneo_funding_maximum_price);
// wpneo_funding_recommended_price
$wpneo_funding_recommended_price = intval( sanitize_text_field($_POST['wpneo_funding_recommended_price']) );
wpneo_crowdfunding_update_post_meta_text($post_id, 'wpneo_funding_recommended_price', $wpneo_funding_recommended_price);
to
// _nf_funding_goal
$_nf_funding_goal = sanitize_text_field($_POST['_nf_funding_goal']) ;
wpneo_crowdfunding_update_post_meta_text($post_id, '_nf_funding_goal', $_nf_funding_goal);
// wpneo_funding_minimum_price
$wpneo_funding_minimum_price = sanitize_text_field($_POST['wpneo_funding_minimum_price']) ;
wpneo_crowdfunding_update_post_meta_text($post_id, 'wpneo_funding_minimum_price', $wpneo_funding_minimum_price);
// wpneo_funding_maximum_price
$wpneo_funding_maximum_price = sanitize_text_field($_POST['wpneo_funding_maximum_price']) ;
wpneo_crowdfunding_update_post_meta_text($post_id, 'wpneo_funding_maximum_price', $wpneo_funding_maximum_price);
// wpneo_funding_recommended_price
$wpneo_funding_recommended_price = sanitize_text_field($_POST['wpneo_funding_recommended_price']) ;
wpneo_crowdfunding_update_post_meta_text($post_id, 'wpneo_funding_recommended_price', $wpneo_funding_recommended_price);
Fronpage/Campaign Submission Form
Replace this code on the /wp-content/plugins/wp-crowdfunding/includes/woocommerce/class-wpneo-frontend-campaign-submit-form.php
Line# 79-83
if( $_POST['wpneo-form-min-price'] ){ $min_price = intval(sanitize_text_field($_POST['wpneo-form-min-price'])); }
if( $_POST['wpneo-form-max-price'] ){ $max_price = intval(sanitize_text_field($_POST['wpneo-form-max-price'])); }
if( $_POST['wpneo-form-recommended-price'] ){ $recommended_price = intval(sanitize_text_field($_POST['wpneo-form-recommended-price'])); }
if( $_POST['wpneo-form-funding-goal'] ){ $funding_goal = intval(sanitize_text_field($_POST['wpneo-form-funding-goal'])); }
to
if( $_POST['wpneo-form-min-price'] ){ $min_price = sanitize_text_field($_POST['wpneo-form-min-price']); }
if( $_POST['wpneo-form-max-price'] ){ $max_price = sanitize_text_field($_POST['wpneo-form-max-price']); }
if( $_POST['wpneo-form-recommended-price'] ){ $recommended_price = sanitize_text_field($_POST['wpneo-form-recommended-price']); }
if( $_POST['wpneo-form-funding-goal'] ){ $funding_goal = sanitize_text_field($_POST['wpneo-form-funding-goal']); }
Screenshot: https://i.imgur.com/IwqsBpM.png

Let me know if you have any other questions.