I have website with SQL certificate from StartSSL. It work's fine on desktop browsers, but on several mobile browsers I see security error. I See error on iPhone 6+ and iPhone 7, on old iPhones and Android devices it works fine. I checked this topic and other: SSL certificate is not trusted - on mobile only On SSLlabs my server has A rate - no vulnerability founded, cert is OK. https://whatsmychaincert.com/ say that all good.
Could you please help? Where is my error? Sorry for my english.
Url of website: https://bv app dot ru (without spaces, dot = .).
Thanks.