I am facing an issue on iOS 10.3. As I load the epub content on the UIWebView with paging enabled. The content is being clipped on the left for Arabic content. This issue rised in iOS 7 then was solved in iOS 8, and now it's back. The same issue is faced on iBooks for Arabic content on the same iOS version.
Clipped content on UIWebView on iOS 10.3
The same issue for us even after updating iOS to 10.3.1
The issue has been resolved in iOS 10.3.2 beta 2