If you are using the "WP Fastest Cache" plugin, you may encounter some issues with FunnelKit (formerly WooFunnels) pages when running the funnels. This is due to aggressive page caching (which is a good thing!), but it can be easily resolved by excluding the offer page URI from the cache plugin.
You need to exclude offer pages by following these instructions:
Step 1: Note down the slug of your offer page from the general settings
Step 2: Open the settings of "WP Fatest Cache"
Step 3: Jump on the “Exclude” tab.
Step 4: Click on the “Add New Rule”
Step 5: Select "contain" as showing below from dropdown and enter your noted offer page slug (from step 1)
The final setup like this ->
Step 6: Click on Save button to close this popup and exclude the offer page from cache.
Here the final settings you saved:
By default, the upsell pages slug is "offer". If you had changed the offer pages slug for any reason get the slug from FunnelKit (formerly WooFunnels) > Settings > General > Permalinks