Clear cache not working on the frontoffice webpage

I am unable to clear the cache when I am logged as administrator and i navigate over my web.
On the past it was working.

All the menù items are not working

Clear Cache of this Page
Delete Cache
Delete Cache & Minified CSS/JS

On the backoffice administration section the relative menù works

Delete Cache
Delete Cache & Minified CSS/JS

I have installed the latest plugin version with the latest wp version.

Thanks
Best
Cristian

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