If you are using the "WP Rocket" plugin, you may encounter some issues with Aero/the Funnel Builder Checkout page when visiting the checkout. This is due to aggressive page caching (which is a good thing!), but it can be easily resolved by excluding the checkout page URL from the cache plugin.

You need to exclude checkout pages by following these instructions-

Step 1: Note down the slug of your checkout page from the FunnelKit (formerly WooFunnels) general settings tab

Step 2: Open the settings of “WP Rocket” and click on "Advanced" tab.

Step 3: To exclude "checkouts" pages enter your noted checkout page slug (from step 1) with special characters as shown in screenshot: "/checkouts/(.*)

Once done, click on "Save Changes".

Note: By default, Checkout page's slug is "checkouts". If you had changed the checkout pages slug for any reason get the slug from FunnelKit (formerly WooFunnels) > Settings > General > Permalinks