If you're using LastPass to do form filling then it, by default, ignores autocomplete="off". At this time we only set this for the password field, but we'll be adding it to the whole form in a later build. Form fill however shouldn't fill without being manually trigger. I do not recommend setting up form fill to auto fill. This means the only autocomplete you should have is username and password. For LastPass to respect autocomplete="off" you need to go to LastPass > Preferences > Advanced and toggle that on. Beyond setting autocomplete="off" in the HTML there's nothing more we can do about this.