WP fastest cache doesn’t work on my website

if a url contains a query string, the page is not served via cache. please take a look at the following tutorial.
https://www.wpfastestcache.com/tutorial/cache-url-with-querystring/

Is that also with this link or should I do there something else?
https://www.sunfamily.nl/zoek-en-boek/?swoof=1&product_cat=zonvakantie

I don’t know what a query string is? But I don’t see the words: action=something in it?

“?swoof=1&product_cat=zonvakantie” this is query string.

Hi Emre Vona, thanks a lot. ?? I understand it now and gone change it.

I see another problem. I don’t think he cached well on the product pages or is there another mistake. Can you see why? And let me know what I must do to change it?

https://www.sunfamily.nl/product/casa-fontelheira/

All the product pages are now 0 aanbieders.(providers)
It’s by all the +- 20.000 product pages.

Kind regards,

Lucas