If you are using the "Breeze" Plugin by Cloudways, you may encounter some issues with empty carts when visiting the checkout page. This is due to aggressive page caching (which is a good thing!), but it can be easily resolved by requesting that WP Engine set up a special cache exception for your checkout page.
You need to exclude checkout pages by following these instructions:
Step 1: Note down the slug of your checkout page from the general settings
Step 2: Open the settings of "Breeze" under the Settings tab.
Step 3: Jump on the "Advanced Options" tab.
Step 4: Locate the option "Never Cache these URLs"
Step 5: To exclude “checkouts” pages enter your noted checkout page slug (from step 1) as shown in screenshot-
Step 6: Click on the Save Changes button to save the settings.
By default, the Checkout page's slug is "checkouts". If you had changed the checkout pages slug for any reason get the slug from WooFunnels > Settings > General > Permalinks.