Problem with Varnish cache

Hi,

I have a problem with Varnish cache.
Basically it’s counting when cliked but it’s not refreshing the counter. i starts, but then I get an empty bracket like () without the number inside.
When I refresh the whole page, the counter gets updated.

Any hints?

All the best,
Istvan

https://www.ads-software.com/plugins/like-dislike-counter-for-posts-pages-and-comments/