I think the tiling glitch in Safari is a bug in the Safari browser (it looks fine in Chrome). I've been working with appMobi to improve integration and Tiled Background support should be coming in the next update. So hopefully things will improve soon...
Thanks for your answer!
Well, are you sure your answer is related to Safari and Chrome for iOS? don't try to confuse between safari and chrome for desktop and Safari and Chrome for iOS (iPhone, iPod and iPad). This iOS version that Chrome for iOS is using Safari Core, Apple isn't doing very well for some reasons to third party browsers.
I can wait for next update :)
I would like to know another thing, isn't possible to create animation for tiled backgrounds?