Hi Christiane,
Thanks for reaching out to us about caching. Each plugin for caching is different so you will need to find the option to exclude certain pages from being cached – this is often in the plugin settings but can sometimes be found on the page itself as a checkbox.
This is not a theme issue but if you update this ticket, in a private reply, with some admin credentials I can take a look for you if you wish.
Thanks,
Kieran
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