Not working in some Apple device

Instant articles works great in android, but there is inconsistencies in iPhone. In some iPhones it work, but on other test Iphones, every instant articles from our facebook page doesn’t work. I suspected the plugin/rss feed generation as the issue because other competitor businesses facebook instant article pages works on the same test iPhone which our instant facebook article fails to load (see screenshot link): https://prntscr.com/oigfam

Hope that you can provide fix and support for this plugin because it helps a lot of devs.