Issues with WP Fastest Cache and WC Catalog Enquiry

Hi,
my problem is, that enquiries, send with WooCommerce Catalog Enquiry, are not sent when WP Fastest Cache is enabled. As soon as I deactivate FC it works.

Example for a Enquiry:
https://wohnmobile-hannover.de/vermietung/vermietung-wohnmobile/kastenwagen/activity-class/chausson-twist-exclusive-v-597-cs3-se/

Can you tell me what to do?

Thx

The page I need help with: [log in to see the link]