Cache not clearing

Hello,

Although we keep updating our website on a daily basis, the cache is not being cleared and still shows “old versions” from 2 weeks ago.

WP Fastest Cache file was created in 0.78519606590271 seconds, on 05-03-20 20:20:55

We already tried:
Disabling the browser caching option
Deleting the cache from settings page
Deleting the folder wp-content/cache via FTP
Deleting our browsers cache

Hope somebody can help!

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