Issue: BBcode turning to html?

I'm having issues with this new post interface. If I go back or the connection is accidentally reset in between posting, all the BBcode changes to lengthy html. In case of images, the IMG code turns into a very big html link and hangs my browser, ultimately crashing it. The text I've written can neither be copied, not gets saved into site's or firefox's auto content so once it's gone, it's gone forever. It's getting very difficult in case of bigger posts specially. I tried starting firefox in safe mode too, but it doesn't fix the issue.