Please try the following one by one:

Go to AdGuard's main screen and tap (Update Filters) in the right upper corner. Check if your problem is solved.
Go to SettingsSafari protectionUser rules and check if there are any rules that contain the problematic website's name. Disable them and check if it solves the problem.
Go to SettingsSafari protectionFilters and disable all filters to see if that will fix the problem. If it does, start re-enabling them one by one, checking after each filter if the website(s) are displayed as they should. This will help pinpoint the problematic filter.
If it's one of AdGuard filters, let us know about it by contacting support@adguard.com, and we will fix the problem.

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De: +44 20 3974 2348
AdGuard download has started Click the button indicated by the arrow to start the installation. Izaberite „Otvori“ i kliknite na „U redu“, a zatim sačekajte da se datoteka preuzme. U otvorenom prozoru prevucite ikonu AdGuard u fasciklu „Aplikacije“. Hvala vam što ste izabrali AdGuard! Izaberite „Otvori“ i kliknite na „U redu“, a zatim sačekajte da se datoteka preuzme. U otvorenom prozoru kliknite na „Instaliraj“. Hvala vam što ste izabrali AdGuard! Install AdGuard for mobile devices as well