Caching error?

The page cache is not updated. Because of this, scripts do not work. The cache is updated if you add any parameter to the url, for example:
https://halvita.ru/?upd – good
https://halvita.ru/ – old cache. HOW TO DELETE THIS CACHE?

The page I need help with: [log in to see the link]