I've some problem with magento 126.96.36.199, I activated all the errors view but I'm not able to understand why it doesn't place order, it is stucked at step 6 of checkout and at step 2 if I activate some errors views. That's the site.
You server runs on PHP 7.3.9, Magento 188.8.131.52 is only compatible up to PHP 5.6 out of the box. PHP compatibility to PHP 7.1 and 7.2 is included in Magento 184.108.40.206 or higher. So a simple core update would help here – but this won't make the shop compatible to PHP 7.3, only up to PHP 7.2.
I would try to downgrade your PHP version and update your shop first and see if the errors still appear.