When using OceanWP, you may encounter an issue where adding products to the cart results in a blank side cart. This is because OceanWP has their own AJAX Add to Cart feature which does not properly send the cart fragments to listening event handlers.
The fix is simple:
Step 1: Enable CheckoutWC AJAX Add to Cart
Go to WP Admin > CheckoutWC > Side Cart and check the box for Enable AJAX Add to Cart
Step 2: Disable OceanWP AJAX Add to Cart
Go to WP Admin > Appearance > Customize > WooCommerce > Single Product an uncheck the option Enable AJAX Add To Cart and click Publish.
That’s it
After you make this adjustment, CheckoutWC will handle adding products to the cart instead of OceanWP and everything will work properly.