I’ve encountered the both of these on iOS 9 (but not before 9).
However since several forums I use all upgraded Discourse to the latest release at about the same time, I wasn’t 100% sure if it was the OS, browser’s incompatibility with iOS 9, or the new Discourse upgrade, so I thought to wait a bit more to see if any browser update comes out.
(I don’t use Mobile Safari, but the both bugs appear in my browser too).