You have to debug and for this, use a Twenty theme. Read more use ajax and can generate conflict with outdated theme or plugins, or simply not updated js files.
Actually there is a little JS notice:
OneSignal: Could not load iFrame with URL https://otoparkcom.onesignal.com/sdks/initOneSignalHttp. Please check that your 'subdomainName' matches that on your OneSignal Chrome platform settings. Also please check that your Site URL on your Chrome platform settings is a valid reachable URL pointing to your site.
