I also want to mention I have Contact Form 7 Conditional Fields, Contact Form 7 Multi Step Pro and Contact Form Entries, among other plugins if that helps.
The conflict is with your caching. You need to disable caching on the form page.
What other plugins and theme do you use on the site?
Thanks – heres my plugins
Akismet Anti-Spam
All-in-One WP Migration
All-in-One WP Migration Unlimited Extension
Autoptimize
Bridge Core
Business Directory Plugin
CDN Enabler
CoBlocks
Contact Form 7
Contact Form 7 Conditional Fields
Contact Form 7 Multi Step Pro
Contact Form Entries
Mobile Contact Bar
Responsive Lightbox
Send PDF for Contact Form 7
Slider Revolution
Smash Balloon Instagram Feed
Team Members VC Addon
WP Review Slider Pro (Premium)
WP Rocket
WPBakery Page Builder
Yoast Duplicate Post
Disable cache for each form page? How can I do that WP Rocket?
Try switching to the default theme, deactivating all plugins excluding Contact Form 7 and Akismet Anti-Spam, and clearing all cache data.
Why you are advised to deactivate plugins and switch to the default theme.