That I think must be related to something else – there isn’t a single http resource in the plugin itself, everything is loaded via the site url. So it’s either a site cache issue on that phone, or the browser cache issue. If one of the phones work, then all of them should.
I just checked with my iphone and ipad, and both work correctly, thus it should be a cache problem. There is a small chance that those phones reject the cloudflare certificate, as it’s part of the comodo platform, but if that’s the case, there is nothing we can do about it.