Ok you got me. I upgraded the keyboard on your iphone so you'd have troubles on ozcards! There I said it.
Seriously, i used to have all sorts of weird issues on chrome on my android phone, but its been fixed in the last few months. Nothing done on the site, some thing was obviously fixed or changed elsewhere.
I have a solution. Stop spelling words incorrectly and you won't need to use auto correct!!!
As has been said, its imoossible to make the site work in every single browser on every single device. Something will always be broken on one device or another. Use another browser or get Taptalk which works well enough for mobile replying.