stock doesnt adjust, after complete the order

Please provide a detailed basic information, such as your woocommerce version,
your stock management settings, your RFQ-ToolKit settings. Does this happen on your WooCommerce cart? Does it happen in your quote cart?

Also, by order completed, do you mean when request for quote is submitted or when customer has paid for the order?

Hello the wc version is 3.2.1. My stock management settings are below:

stock management: activated
product reserve: 60 minutes
notifications activated

in the product level:
stock management: activated
stock: 150
stock status: available

Following options in RFQ Toolkit:
General:
1. Checkout Options: RFQ
2. Always show prices with RFQ CHeckout yes
3. no
4. no

links:
nothing selected

Quote Request Page:

https://bamboo-fireworks.de/?page_id=18624

This is my website: https://bamboo-fireworks.de

By order Completed it means that the customer has paid for the order.

Thx for your help

Greatz from germany

You could put the following in in wp-config.php( at the begining is OK). Any PHP warnings will be exposed and may give a clue. All the errors/warnings will be recorded in:
wordpress_directory/wp-content/debug.log

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
ini_set('error_reporting', E_ALL);

if it is a live site and you don’t want to let customers seee the erros. put this also in
the wp-config.php:

define( 'WP_DEBUG_DISPLAY', false );

Next create a fake order and make it complete. check in the debug.log file and post the contents.