the-thing Cache service can enable webpages to be pre-fetched on the clients, the proxies, and the servers. There are many advantages of web caching, including an improved performance of the web as it decreases server round trips for fetching data from the database by persisting data in the memory however, cache service has it own disadvantages as the past data or current modifications which have been done dont get reflected at times so it is required to be disabled at times in order to have the changes reflected
Usually, Cache service shouldnt be enabled when the site is in development mode.
As apparently seen with the relative changes for logo, I can notice img reference appearing twice on your site for open canvas menu due to which the previous logo is overriding the updated one which shouldnt happen in usual course as I have also tried to replicate the same at localhost and the logo reflects fine.
Following is the img tag references appearing twice. It concurrently happens for the other logo, too
<img class="logo-img" src="/images/UAH-logo-small.png" alt="Вместе против гепатита">
<img class="logo-img-sm" src="/images/UAH-logo-big.png" alt="Вместе против гепатита">