Weglot languages are not translated

Dear support, we have a problem with weglot on our website. We use wp fastest cache and sometimes when we try to switch languages our site is not translated. This all happens with the static content only with the browser cache.

Where we have a dynamic content which we call with the php for weglot current language value there everything works great but the static content on the same page or menu is not translated (but flag is switched to the new language, only text is not translated). Do you have any idea how to fix this? When we delete cache it is okay. But we need to figure out if we need to change the caching plugin or why does this happen and how to fix this issue. I saw you had a similar topic on the support before but I did not find any working solution.