Hello,
1. WooCommerce developers have added some new options in version 3.3 related to products number per row and per page https://woocommerce.wordpress.com/2017/12/09/wc-3-3-will-look-great-on-all-the-themes/ WooCommerce set the higher priority for the new option and it overwrites our settings.
You can change number of products per row using Customizer ( > WooCommerce > Product Catalog > Products per row).
2. Please check your Responsive settings – https://prnt.sc/j1504g
Regards