A while ago I had some problems (as did others) with using the mobile site with SwiftKey keyboard. I'm now having the same problems (jumbled up text, slow appearance of words, jumping back through text and replacing etc) with my phone's stock keyboard! I've hardly replied to any threads recently because it's so difficult and irritating. I think the consensus last time was that it was a SwiftKey issue but I have tried swiftkey and my phone's stock keyboard now, on both chrome and Firefox mobile. I'm using an android phone.
Please help!